Johnson Controls T9800 Series - Configuring MS;TP; Wiring the Network; End-Of-Line Termination

T9800 series BACnet MS/TP Networked Thermostat Controller Technical Bulletin
Rev 1.4
4 | P a g e
Output
Relay(H/C)
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3-stage Relay(FAN)
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AO 0~10VDC(H/C)
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AO 0~10VDC(EC FAN)
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input
Binary Input
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AI NTC(10K)
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AI 0~10VDC PICV
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Function
fan speed (low,mid,high,auto)
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touch screen
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℃/℉ optional
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ventilation
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occupancy dry-contact input
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remote sensor
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key lock
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set point limit
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auto changeover
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restart after power failure
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low-temperature protection
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Setting mode
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Humidity display
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BACnet
MS/TP
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Segmentation
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auto baud rate
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Power
supply
Terminal voltage 220VAC
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Terminal voltage 24VAC
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3. Configuring MS/TP
The T9800 supports network connectivity to BAS using a BACnet MS/TP.
3.1 Wiring the network
BACnet MS/TP run over the physical connection RS-485 connection, which requiring three
connections:
 A
 B
 COM
Connect the T9800 in line with other devices on the network.
3.2 End-of-Line termination
T9800 doesn’t support an on-board EOL termination. It is strongly recommend that the first device