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116 RS-485 serial connection setup
Section 5: Startup and meter configuration Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
c. To configure Port B for RS-485 Full Duplex operation, set the switches as
indicated in the table below (see Figure 3-24 for switch bank locations):
d. To configure Port B for RS-485 Half Duplex operation, set the CPU board and
Field Connection board switches as indicated in the table below (see Figure 3-24
for switch bank locations):
Table 5-8 Serial Port B RS-485 full duplex configuration switch settings
Board Switch Position
CPU S4-1 RS485
S4-2 RS485
S5-2 FULL
S7-1 RS485
S7-2 RS485
Field Connection Termination On Termination Off
S1-5 TERM ON (RX) TERM OFF (RX)
S1-6 TERM ON (TX) TERM OFF (TX)
S1-7 FULL DUPLX
NA
S1-8 FULL DUPLX
NA
Table 5-9 Serial Port B RS-485 half duplex configuration switch settings
Board Switch Position
CPU S4-1 RS485
S4-2 RS485
S5-2 HALF
S7-1 RS485
S7-2 RS485
Field Connection Termination On Termination Off
S1-5 TERM ON TERM OFF
S1-6 TERM OFF TERM OFF
S1-7 HALF DUPLX
S1-8 HALF DUPLX
Termination should only be enabled if the meter is the last drop in a multi-drop
configuration or the only meter in a single-drop configuration.