DigitalFlow™ XGM868i Startup Guide 13
Chapter 1. Installation
1.7.4b Wiring the RS485 Interface
Use the optional RS485 serial port to network multiple XGM868i flow transmitters to a single control system. As an
option, the standard RS232 port on the XGM868i may be configured as a
two-wire, half-duplex RS485 interface.
IMPORTANT: The Model XGM868i must be configured at the factory for RS485 operation.
To wire the RS485 serial port, refer to Figure 10 on page 25 and complete the following steps:
WARNING! Dangerous voltages exist within the electronics enclosure. Do not attempt to wire the unit until
the main power has been disconnected
1. Disconnect the main power and remove the rear cover.
WARNING! The XGM868i must be moved to a safe environment before removing either 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 J1 and secure the cable clamp. Use the
information in Table 3 to wire a suitable cable for connecting the XGM868i to the external device.
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.
Table 3: RS485 Connections
J1 Pin # Signal Description
9 Data +
8 Data -
7 Shield
6 Not Used
5 Not Used
4 Not Used
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