Modbus Connection; Modbus Considerations - Honeywell CIPer 50 Installation & Commissioning Instructions

CIPer MODEL 50 CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS

MODBUS CONNECTION

The CIPer Model 50 controller supports both Modbus RTU master and Modbus RTU slave functionality.
Modbus slaves can be connected to either or both of the two onboard RS485 interfaces: RS485-1 (consisting of push-in
terminals 24 [GND-1], 25, and 26) or RS485-2 (consisting of push-in terminals 29, 30, 31 [GND-2]).
NOTE: GND-2 is internally connected with 24V-0 (terminal 1)

Modbus Considerations

•
RS485-1 (isolated)
Max. Modbus length: 3600 feet (9.6 – 78.8 kbps) or 2400 feet (115.2 kbps) (see also section "RS485 Standard" on
˗
pg. 10).
Use only shielded, twisted-pair cable and daisy-chain topology.
˗
Must conform to EIA-RS485 cabling guidelines (see section "EIA 485 Cable Specifications" on pg. 30).
˗
•
RS485-2 (non-isolated)
Max. Modbus length: 3600 feet (9.6 – 78.8 kbps) or 2400 feet (115.2 kbps) (see also section "RS485 Standard" on
˗
pg. 10).
Use only shielded, twisted-pair cable and daisy-chain topology.
˗
Ground noise should not exceed the EIA-485 common mode voltage limit.
˗
Must conform to EIA-RS485 cabling guidelines (see section "EIA 485 Cable Specifications" on pg. 30).
˗
Should not extend beyond a single building.
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• Max. no of Modbus devices per CIPer Model 50 RS485 interface: 32 (including the CIPer Model 50, itself, which is
counted twice)
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