GE DigitalFlow XMT868i Startup Manual page 19

1.7.4b Wiring the RS485 Interface
Use the optional RS485 serial port to network multiple XMT868i flow transmitters to a single computer terminal. As
an option, the standard RS232 port on the XMT868i may be configured as a two-wire, half-duplex RS485 interface.
The XMT868i must be configured at the factory for RS485 operation. The maximum cable length for
IMPORTANT:
RS485 is 4000 ft (1200 m).
To wire the RS485 serial port, refer to Figure 10 on page 23 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 to terminal block
the information in Table 2 below to wire a suitable cable for connecting the XMT868i to the external device.
WARNING!
Appendix A, CE Mark Compliance.
4. If wiring of the unit has been completed, reinstall the rear cover on the enclosure and tighten the set screw.
Proceed to the next section to continue the initial wiring of the unit.
DigitalFlow™ XMT868i Startup Guide
Table 2: RS485 Connections
J1 Pin #
9
8
7
6
5
4
To meet CE Mark requirements, all cables must be installed as described in
Signal Description
Data +
Data -
Shield
Not Used
Not Used
Not Used
Chapter 1. Installation
and secure the cable clamp. Use
J1
11