DigitalFlow™ XMT868i Startup Guide 11
Chapter 1. Installation
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.
IMPORTANT: The XMT868i must be configured at the factory for RS485 operation. The maximum cable length for
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
J1 and secure the cable clamp. Use
the information in Table 2 below to wire a suitable cable for connecting the XMT868i 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 2: RS485 Connections
J1 Pin # Signal Description
9 Data +
8 Data -
7Shield
6Not Used
5Not Used
4Not Used
WARNING! To meet CE Mark requirements, all cables must be installed as described in
Appendix A, CE Mark Compliance.
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