Wiring The Modbus/Service Port - GE PanaFlow HT User Manual

Chapter 2. Installation

2.5.4 Wiring the Modbus/Service Port

The XMT900 flow transmitter is equipped with a Modbus communication port for either a connection to Vitality (PC
software) or to a separate control system. The port is an RS485 interface.
IMPORTANT:
The maximum cable length for RS485 is 4000 ft (1200 m).
To wire to this RS485 serial port, refer to Figure 10 on page 11 and complete the following steps:
1. Disconnect the main power to the unit and remove the rear cover.
2. Install the required cable clamp in the chosen conduit hole on the side of the electronics enclosure.
3. Feed one end of the cable through the conduit hole, wire it as shown in Figure 15 below.
4. If wiring of the unit has been completed, reinstall the wiring cover on the enclosure and tighten the set screw.
Note: Prior to use, the serial port must be programmed.
WARNING! Make sure all covers, with their O-Ring seals, are installed and the set screws tightened before
applying power in a hazardous environment.
Terminal Block -Modbus Connections
PIN Label Description
1 MOD- Modbus/Service Port Negative
2 MOD+ Modbus/Service Port Positive
Figure 15: Modbus Connections
PanaFlow HT User's Manual 19