GE DigitalFlow GF868 Startup Manual page 20

Chapter 1. Installation
1.7.4b Wiring the RS485 Interface
Use the optional RS485 serial port to network multiple GF868 flowmeters to a single computer terminal. Upon request,
the standard RS232 port on the GF868 may be configured as a two-wire, half-duplex RS485 interface, through a device
such as the INMAC Model 800052 RS232-RS422/RS485 converter.
To wire the RS485 serial port, refer to Figure 9 on page 18 and complete the following steps:
1. Disconnect the main power to the unit and remove the 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.
Connect the other end of the cable to the converter, as shown in Figure 4.
WARNING!
4. If wiring of the unit has been completed, reinstall the plastic shroud, close the cover on the enclosure and tighten
the latches.
5. Connect the converter to the control system, as described in its User's Manual.
10
GF868
NC 6
NC 7
RX 8
TX 9
Figure 4: Typical RS485 Connections
To meet CE Mark requirements, all wiring connections must be installed as
described in Appendix A, CE Mark Compliance.
Converter
1 TD OUT
2
3
4 RD IN
DigitalFlow™ GF868 Startup Guide (1 and 2-Channel)