P72WIAS2Water Intrusion Sensor

1 INSTRUCTION MANUAL Model WIAR1 Wireless Single Port Receiver Wireless Water Intrusion Sensor Model WIAS2/Wireless Freezing Pipe Sensor Model WIAS3 Contents of package: • (1) Single Port Receiver • (1) Wireless Sensor (model WIAS2/WIAS3) • (8) 1” #6 Phillips head screws • (8) Plastic anchor inserts • (8) Molly bolts Tools you will need: • Phillips head screwdriver for #6 size screws • Small awl • Small hammer • Magic marker • Drill w/ 3/16” masonry bit or 3/32” wood bit for pilot holes when installing receivers and sensors on masonry or wood. Product Overview: • The model WIAR1 is a single port receiver that reacts to coded information received from a Wireless Water Intrusion or Wireless Freezing Pipe Sensor. A wireless sensor can be located in a computer center, constantly checking for water intrusion or variations in temperature. The Single Port Receiver can be placed in another location and linked to a security system where alarm information is passed on to a central alarm center. The Single Port Receiver can also be set up to take action on its own by shutting off the water or vent pipes, etc., in the event of a water intrusion or temperature-related problem. To ensure that the system is functioning properly, the sensor sends status information daily that is indicated on the Single Port Receiver’s LED display. Getting Started: • Before mounting any sensors, choose a location for the Single Port Receiver. Try to avoid steel cabinets, machinery, etc. that can interfere with the transmission of signals. Sensors can typically communicate with a receiver up to 350 feet away, a more than adequate range for most installations. • An ideal place for the Single Port Receiver is on a wall about 5 feet off the floor. A mounting height of 5 feet is good for reading the receiver’s display. Powering up the Single Port Receiver: • Before mounting the receiver in its final location you should connect the unit to a 12VDC power source. General Sensors Inc. recommends using 22 AWG, stranded wire when connecting to a power source. • In the event that 12VDC power is not available from a centralized alarm box or similar source, you can power the Single Port Receiver from a small 12VDC power module available from General Sensors Inc., or other suppliers. Make sure the current rating of the power module is 200mA or greater. The power outlet should be non- switched, meaning that light switches must not turn the receiver off. • To attach the 12VDC power source, locate the terminal port on the Single Port Receiver.(see fig.3). Using a small flat head screwdriver, press on the arm of the jack labeled “-“ and insert the negative lead into the jack. Do the same for the jack labeled “+” and insert the positive lead into the jack. On the small 12VDC power supply furnished by General Sensors, Inc., the terminal labeled “1” is +12VDC, terminal “4” is the negative lead. Terminal “2” is ground from the 110VAC if you wish to connect ground to the Single Port Receiver. • When the Single Port Receiver has been connected to a 12VDC power source the Green LED labeled Power On will light. Mounting the Single Port Receiver: • Place the Single Port Receiver against the wall where it is going to be mounted and mark the four mounting holes with a small awl or a pencil. For installations on a wooden wall, using a 3/32” drill bit, drill 4 pilot holes in the marked spots and attach the sensor to the wall with the 4 #6 screws provided. For sheet-rock or other hollow walls, use the 4 Molly bolts provided. For concrete walls, drill pilot holes with a 3/16” masonry drill bit, insert the 4 plastic anchors and secure the sensor to the wall with the #6 screws. 2 I. Using the Single Port Receiver with Wireless Sensors 1.Installing a Wireless Sensor with the Single Port Receiver: • The model WIAS2 Wireless Water Intrusion Sensor is a wireless sensor designed for early detection of water. This is particularly useful where water can cause damage to valuable assets; such as in rooms that house computers and telecommunications equipment, power distribution vaults, and record keeping areas. • The WIAS3 Wireless Freezing Pipe Sensor is a wireless sensor designed to sense air and pipe temperature. This is useful anywhere pipes are in danger of freezing, such as in unheated areas during the colder months. • Each sensor and Single Port Receiver share the same sensor number code so that the receiver can identify which sensor is sending data. If there is a water intrusion or temperature-related problem it is important to know which sensor is reporting a problem. • If you are installing only one wireless sensor with the Single Port Receiver you do not have to set the code, the sensor number has already been set by the factory to sensor #1. However, it may be useful to take a magic marker and mark the case sensor #1. Wireless Water Intrusion Sensor Model WIAS2 Wireless Freezing Pipe Sensor Model WIAS3 Battery Port DIP Switches TEST Button figure 1 figure 2 Battery Port TEST Button DIP Switches Single Port Receiver Model WIAR1 figure 3 DIP Switches Beeper On/Off RESET Button Terminal block 3 2.Installing multiple wireless sensors and Single Port Receivers: • To install more than one wireless sensor and single port receiver you will have to set each sensor and its own receiver to a different code so that they can communicate. Follow these 4 easy steps to set the code: 1) Mark the case of one sensor sensor #1, and one receiver receiver #1. The DIP switches in the units have already been set by the factory to identify sensor #1. All DIP switches in the unit should be in the ON position. 2) For sensor and receiver #2 you will have to set the DIP switches. First you must remove the polyurethane covers. Locate the DIP switches on the printed circuit board in the units. With a pen or sharp instrument, push switch position 1 to the OFF position. Mark the sensor’s case sensor #2 and the receiver’s case receiver #2. 3) For sensor and receiver #3, set DIP switch po…

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1 INSTRUCTION MANUAL 4 Port Wireless Receiver Model WIAR2 Wireless Water Intrusion Sensor Model WIAS2/Wireless Freezing Pipe Sensor Model WIAS3 Contents of package: • (1) 4 Port Wireless Receiver • (3) 1” #6 Phillips head screws • (3) Plastic anchor inserts • (3) Molly bolts Tools you will need: • Phillips head screwdriver for #6 size screws • Small awl • Small hammer • Magic marker Other tools you may need: • Drill w/ 3/16” masonry bit or 3/32” wood bit for pilot holes when installing a 4 Port Receiver on masonry or wood. Product overview/Features: • The model WIAR2 is a 4 Port Wireless Receiver that reacts to coded information received from wireless water intrusion and/or freezing pipe sensors. For example, wireless sensors can be placed in various locations, constantly checking for water intrusion or variations in temperature. The 4 Port Receiver can be placed in another location nearby and linked to a security system where alarm information is passed on to a centralized alarm center. The 4 Port Receiver can also be configured to take action on its own, shutting off water or vent pipes in the event of a water intrusion or temperature-related problem. • The 4 Port Wireless Receiver receives status information from each sensor every 24 hours, indicating the ability of the sensor to operate properly and provide warning, alarm and/or electrical closures to other systems when there is a water intrusion or temperature related problem. The 4 Port Wireless Receiver also has the ability to make dynamic tests of the standby battery to make sure there is sufficient battery life when commercial power fails. The LED’s on the 4 Port Wireless Receiver will light when there is a problem, such as the failure of a sensor to perform a daily check-in or the presence of a warning or alarm condition. • Whenever there is a problem, such as the failure of a sensor to check-in or the presence of an Alarm condition, the 4 Port Wireless Receiver displays the number of the sensor reporting a problem. If one sensor is reporting an alarm and another has failed to check-in, the 4 Port Wireless Receiver’s display will scroll through both numbers and the corresponding red LED will light. Getting Started: • Before you mount any sensors, choose a location for the 4 Port Wireless Receiver. Consider the space between the 4 Port Receiver and where you plan to mount the wireless sensors, are there steel cabinets, machinery, etc., near the antenna, at either end, that might interfere with the transmission of signals? Sensors can typically communicate with a 4 Port Receiver up to 350 feet away, a more than adequate range for most installations. • An ideal place for the 4 Port Wireless Receiver is on a wall about 5 feet off the floor, away from steel cabinets, machinery, etc. A mounting height of 5 feet is good for reading the receiver’s display. Mounting the 4 Port Wireless Receiver: • Once you have found a suitable location away from steel cabinets, machinery, etc., you can mount the 4 Port Wireless Receiver. Use one of the screws provided to hang the 4 Port Receiver from the plastic molding on the back of the unit. Now, using the 2 mounting holes on the bottom of the receiver you can proceed to secure the unit to the wall with the provided screws. For installations on a wooden wall, using a 3/32” drill bit, drill pilot holes in the marked spots and attach the sensor to the wall with the #6 screws provided. For sheet-rock or other hollow walls, use the 3 Molly bolts provided. For concrete walls, drill pilot holes with a 3/16” masonry drill bit, insert 2 the 3 plastic anchors provided and secure the sensor to the wall using the #6 screws provided. I. Using the 4 Port Wireless Receiver with wireless sensors: 1. Sensor Basics • The model WIAS2 Wireless Water Intrusion Sensor is a wireless sensor designed for early detection of water. This is particularly useful where water can cause damage to valuable assets; such as in rooms that house computers that house computers and telecommunications equipment, power distribution vaults and record keeping areas. • The WIAS3 Wireless Freezing Pipe Sensor is a wireless sensor designed to sense air and pipe temperature. The unit delivers a warning when air temperature drops below 39°F and an alarm when the pipe temperature dips below 34°F. This is useful in unheated areas during the colder months when pipes are in danger of freezing. • Each sensor linked to the 4 Port Receiver has a different sensor number so that the receiver can identify which sensor is sending data. If there is a water intrusion or temperature-related problem it is crucial to know which sensor is reporting a problem. Wireless Water Intrusion Sensor Model WIAS2 Wireless Freezing Pipe Sensor Model WIAS3 Battery Port DIP Switches TEST Button figure 1 figure 2 Battery Port TEST Button DIP Switches 4 Port WirelessReceiver Model WIAR2 figure 3 DIP switches Jumper ports Terminal block 2.Installing wireless sensors with the 4 Port Wireless Receiver • To install multiple wireless sensors you will have to set the DIP switch on the 4 Port Receiver so that it knows how many sensors it should monitor and can identify each one individually. The 4 Port Receiver has a DIP switch located in the bottom right corner of the circuit board labeled SW1 that indicates which sensors are active. When a sensor is active the corresponding switch must be in the On position. For example, if you are using 4 wireless sensors you want to make sure that all 4 of the DIP switches on the 4 Port Receiver are in the On position. • The 4 Port Receiver can have up to 4 sensors on its system. To communicate individually with the 4 Port Receiver the DIP switches on each wireless sensor must 3 be configured as shown in the table below. If the sensor’s DIP switches are not set as shown below the 4 Port Receiver will not get a valid message. 3. Installing the batteries and testing the sensor codes: • The DIP switches must be set before you install the sensor batter…

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Federal Communications Commission FCC ID: P72WIAR3 7435 Oakland Mills Road P72WIAS2 Columbia, MD 21046 P72WIAS3 To Whom It May Concern: This letter is to comply with section 0.457(d)(I) pertaining to confidential material. General Sensors Incorporated requests that the following documents regarding this submission for FCC ID listed above be kept confidential: Schematic The material above contains trade secrets or technical data which would customarily be guarded from competitors. It represents several years of research and development by General Sensors Incorporated and its availability is normally subjected to confidentiality and non-disclosure agreements. We respectively request that this document not be available to general public. Sincerely, Donald E. Hudson President General Sensors Incorporated 20 Baldwin Drive Branford, CT 06405

FCC ID: P72WIAS2 Response to TCB findings Hi Mike, We have identified the following issues after our review of the application: 1. This application is not activated in response to fire, security or safety of life issues and cannot claim the 15.231 (a) (4) exemption in order to operate continuously. It merely detects a condition which might result in water intrusion. Please examine the rules and submit a response to this issue. The device does not currently comply with the rules. The product software has been modified to operate during an alarm condition without the necessity of the 15.231(a)(4) exemption. The following transmission scheme has been verified through testing at Curtis-Straus: 1) At the initial detection of a fault, three alarm signals are sent. From the start of the first signal to the end of the third signal is 4.6s which satisfies the requirement that the transmission ends within 5sec. 2) 15min after the initial alarm, the sensor checks to determine if the fault condition still exits. If it does, another 4.6s alarm transmission is sent. If the fault no longer exists, no further transmissions are made. 3) Step 2 is repeated at 30min, 45min and 1hr after the initial alarm, but only of the fault condition is detected. If at any point the fault condition ceases, the sequence is halted and no further alarms are sent. Also, at the conclusion of the alarm transmission at the 1hr mark, no further transmissions will occur regardless of the fault condition. 4) At any point a manual reset can be implemented which will reset the sensor to step 1. 2. Please supply a discussion of the actual on-time of the transmitter. While the bit pattern has been somewhat related, it is unclear what the actual maximum on-time of the transmitter is in the worst case 100ms period. Plots of the actual transmitter pulse train should be presented to document compliance. Ans: Please see attached files: Bits.pdf and Transformat.pdf 3. Page 4 of the test report indicates that data was acquired at 10 meters, while the data table indicates 3 meters. Which is correct? Ans: All testing was done at 3 m. 4. For information. All emissions falling within the restricted bands of 15.205 must meet the general limits. Noted 5. Please supply a users manual. Ans: Please see attached files: instructions sWIAR1.pdf and instructions sWIAR2.pdf 6. The form 731 indicates a request for confidentiality. However no formal letter justifying the request for confidentiality was supplied. This letter should also state what is to be classified as confidential. Ans: Please see attached letter-of-con.pdf 7. Please supply details of the antenna connector so compliance with 15.203 can be determined. Ans: Reverse Sex SMA Type 8. Please confirm a fresh battery was used during the testing. Ans: A fresh battery was used when we started the testing first day. Battery voltage was checked before testing every day afterwards to confirm battery charge. Best regards Barry C. Quinlan Certification Manager Curtis-Straus TCB -- Mairaj Hussain EMC Engineer ******************* Curtis-Straus LLC One Stop Laboratory for NEBS, EMC, Product Safety, and Telecom Testing. 527 Great Road Littleton, MA 01460 USA Voice 978-486-8880 ext 275 Fax 978-486-8828 email: [email protected] WWW.CURTIS-STRAUS.COM

Iss.# Respond Systems, Inc. 20 Baldwin Dr. Branford, CT 06405 File: PageOf 3 Senior Tech.: David F. Britton 1 1 0.000 0.000 0.000 0.000 Manufacturing Notes 101 This is a Rose enclosure Rose p/n03081206 12/21/01 Drilling Of Pipe Sensor Enclosure c:\drawingfiles\singlereccase.dft PipeSensorCase 102 Tolerance on all dimensions is +/- 0.010" 103 Grommet for bottom is Mc Master P/N 9600k38 104 Drawing is NOT to scale 2/11/02 0.000 0.000 Grommet End Antenna End 1.571 0.891 Ø0.281 2.414 0.729 Ø0.406 Measure From 1/2 way up case Measure From 1/2 way up case 1.571 0.796 Ø0.578 105 Ground plane should be cut as follows 0.0001.300 0.000 1.500 0.678 0.650 Ø0.265 FCC ID: XXXXXXXXXXXXX (To be assigned) CANADA: YYYYYYYYYYYYY (To be assigned) This device complies with FCC Part 15 and Canada Rules and regulations. Operation is subject to the following two conditions: (1) This device may not cause harmful interference and (2) this device must accept interference that may cause undesired operation. General Sensors, Inc. Wireless Freezing Pipe Sensor (example) Model WIAS3 (example) Made in the USA

MEASUREMENT/TECHNICAL REPORT Company: General Sensors, Incorporated FRN: 0006564041 Model WIAS2 FCC ID: P72WIAS2 Description: This is a report to support a request for an original grant of equipment authorization. Equipment Type: Low Power Communications Device Transmitter (DXX) Report prepared for: General Sensors, Incorporated 20 Baldwin Drive Branford, CT 06405 USA Phone: 203-481-2395 Fax: 203-481-2456 Report prepared by: Mairaj Hussain Curtis-Straus LLC 527 Great Road Littleton, MA 01460 USA Phone: 978-486-8880 FAX: 978-486-8828 FCC Application for General Sensors • FCC ID:P72WIAS2 • Report No. EC0157-2 2-May-02 ______________________________________________________________________ Introduction This report is an application for Certification of a Transmitter operating pursuant to 47 CFR 15.231. The model number covered by this report is WIAS2. This report is designed to demonstrate the compliance of these devices with the requirements outlined in 47 CFR Part 15 using the methods outlined in 47 CFR Part 2. EUT Configuration Work Order: C0157 Company: General Sensors Company Address: 20 Baldwin Drive Branford, CT 06405 Contact: Don Hudson Person(s) Present: None MNSN EUT: WIAS2- EUT Description: Wireless water intrusion sensor. The WIAS2 is a wireless sensor is designed for early detection of water. It is for indoor use only. EUT Max Frequency: 418 MHz Attenuator values for Tx: R1 = 910 ohm, C1 = 62 ohm Support Equipment: MNSN None EUT Cables: QtyShielded?LengthFerrites None Unpopulated EUT Ports: QtyReason None _____________________________________________________________ Curtis-Straus LLC • 527 Great Road • Littleton, MA • TEL (978) 486-8880 • FAX (978) 486-8828 page 2 of 8 FCC Application for General Sensors • FCC ID:P72WIAS2 • Report No. EC0157-2 2-May-02 ______________________________________________________________________ Statement of Conformity The WIAS2 has been found to conform with the following parts of the 47 CFR as detailed below: Applicable FCC part 15C section: 15.231 Periodic operation in the band 40.66 – 40.70 MHz and above 70 MHz. Part 2 Part 15 Comments 15.15(b) The product contains no user accessible controls that increase transmission power above allowable levels. 2.925 15.19 The label will be made from maylor and it will be attached with permanent adhesive. A sample label is shown in the label exhibit. 15.21 Information to the user is shown in the instruction manual exhibit. 15.27 No special accessories are required for compliance. 15.207 The unit is DC powered without the capability of being operated from the AC mains. 15.231 a(1) See WIAS2 Operation Under Section 15.231 15.231 a(2) See WIAS2 Operation Under Section 15.231 15.231 a(3) See WIAS2 Operation Under Section 15.231 15.231 a(4) Not employed for radio controlled purposes. See WIAS2 Operation Under Section 15.231 15.231 b(1)(2)(3) See attached data tables. 15. 231 c See attached graphs of the bandwidth 15.231 d NA. Transmitter operates at 418 MHz. 15.231 e Satisfies paragraph b through d _____________________________________________________________ Curtis-Straus LLC • 527 Great Road • Littleton, MA • TEL (978) 486-8880 • FAX (978) 486-8828 page 3 of 8 FCC Application for General Sensors • FCC ID:P72WIAS2 • Report No. EC0157-2 2-May-02 ______________________________________________________________________ Test Methodology Radiated emission testing was performed according to the procedures in ANSI C63.4 (1992). The testing was performed at an antenna to EUT distance of 3 or 1 meter(s) below 30MHz and a distance of 10m above 30MHz. The actual test distance used is noted in the test data sheets. The device’s performance was investigated to 5 GHz. Since the device is installed in one orientation, the emissions were maximized around the vertical axis and the maximum reading was recorded. The integrated antenna cannot be maximized separately. All other performance tests were made in accordance with the procedures outlined in Part 15 of CFR 47. The applicable sections provided under Part 15 are provided in the measurement section of this report. _____________________________________________________________ Curtis-Straus LLC • 527 Great Road • Littleton, MA • TEL (978) 486-8880 • FAX (978) 486-8828 page 4 of 8 FCC Application for General Sensors • FCC ID:P72WIAS2 • Report No. EC0157-2 2-May-02 ______________________________________________________________________ Test Facility Curtis-Straus LLC All testing for the range 9kHz–5000MHz was performed at Curtis-Straus (A2LA Certificate Number 1627-01). The open area test site used to collect the radiated data is located at 527 Great Road, Littleton, MA 01460. Site “T” was used. _____________________________________________________________ Curtis-Straus LLC • 527 Great Road • Littleton, MA • TEL (978) 486-8880 • FAX (978) 486-8828 page 5 of 8 FCC Application for General Sensors • FCC ID:P72WIAS2 • Report No. EC0157-2 2-May-02 ______________________________________________________________________ Test Equipment Used S PECTRUM A NALYZERS x Analyzer Model No. Company Serial No. Calibration Due x G REEN 9kHz-26.5GHz 8593E HP 3829A03618 04-OCT-2002 O PEN A REA T EST S ITES (OATS) x Site FCC Code IC Code VCCI Code Calibration Due x “T” Texas 93448 IC 2762-T R-905/ C-480 09-SEP-2002 A NTENNAS x Antenna Model No. Company Serial No. Calibration Due x G REEN Bilog: 30MHz-2GHz CBL6112B Chase 2742 26-JAN-2003 x O RANGE Horn: 1-18GHz 3115 EMCO 0004-6123 27-MAY-2003 P REAMPLIFIERS x Preamplifier Model No. Company Serial No. Calibration Due x G REEN 0.01-2000MHz ZFL-1000-LN MiniCircuits/ C-S n/a 22-MAR-2003 x O RANGE -B LACK 1-20GH Z SMC-12A MITEQ 690639 06-AUG-2002 Unless otherwise noted the calibration interval is one year. All equipment is calibrated using standards traceable to NIST or other nationally recognized calibration standard. _____________________________________________________________ Curtis-Straus LLC • 527 Great Road • Littleton, MA • TEL (978) 486-8880 • FAX (978) 48…

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General Sensors, Inc. Branford, CT Transmission Code Format 1st message trans. 2nd message trans. 3rd message trans. 4th message trans. issue no. ENGINEERING NOTES 102 The duration of one bit is 4.39245 ms, which is derived from (1/32,768Hz)x(4 clock cycles)x(36 instructions) receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message One High to indicate to receiver's microcomputer that next bit is start of incoming message The receiver compares all 4 incoming messages in the first block of messages and looks for a match on two that are the same. After 2 sec + (sensor # - 1)(0.5 sec) the second block of messages is sent and the receiver compares the 4 new messages for a match ontwo that are the same. The same thing happens on the third block of messages. The microcomputer takes action on each block of messages after the compare is made. Sensor Condition Bit 0 1 2 3 0 0 0 0 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 LSB MSB FIXEDVARIBLE SYSTEM ADDRESS SENSOR NUMBER SENSOR CONDITION (SEE TABLE TO RIGHT) DIRECTION OF TRANSMISSION (LSB FIRST) 1 1 1 0 WARNING MESSAGE FROM TEMP. SENSOR (NOT USED) 0 1 0 0 SENSOR TESTS GOOD 1 1 0 0 CIRCUIT TEST BAD 0 0 1 0 CIRCUIT TEST BAD & LOW BATTERY 1 0 1 0 ALARM 1 0 0 0 TEST BUTTON ON TRANSMITTER WAS PUSHED 0 1 1 0 LOW BATTERY (NO OTHER STATUS CODES ARE USED) 1 2 3 4 5 6 7 Decimal Value 103 One normal instruction takes 122 microseconds. (32,768Hz )/ (4 cycles/ inst.) =8,192 inst/sec. and (1/8192 inst/sec)= 122 microseconds/inst. A branching inst ,like GOTO, takes two instructions cycles. 1st message trans. 2nd message trans. 3rd message trans. 4th message trans. receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message One High to indicate to receiver's microcomputer that next bit is start of incoming message 1st message trans. 2nd message trans. 3rd message trans. 4th message trans. receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message One High to indicate to receiver's microcomputer that next bit is start of incoming message 24 bits 1st message trans. 2nd message trans. 3rd message trans. 4th message trans. receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message One High to indicate to receiver's microcomputer that next bit is start of incoming message 0 1 2 3 4 5 6 7 (Unused) Count of 1's in the 16 bit transmission that follows 24 bits 24 bits24 bits 4.3945 ms 5 bits (21.973 ms) 4.3945 ms 105.468 ms 105.468 ms 105.468 ms 105.468 ms 1st message trans. 2nd message trans. 3rd message trans. 4th message trans. receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message One High to indicate to receiver's microcomputer that next bit is start of incoming message 1st message trans. 2nd message trans. 3rd message trans. 4th message trans. receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message One High to indicate to receiver's microcomputer that next bit is start of incoming message 1st message trans. 2nd message trans. 3rd message trans. 4th message trans. receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message receiver's microcomputer that next bit is start of incoming message One High to indicate to receiver's microcomputer that next bit is start of incoming me…

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