Filter
Top Products
74 Communication settings
Section 3: Installation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
Serial Communication Port Drivers
For serial communication Ports A and B, the driver to be used is individually selectable between
RS-232, RS-485 Half Duplex, and RS485 Full Duplex.
Port A Driver Configuration
The serial communication Port A driver is configured via CPU Board switch banks S3, S5, and S6
and Field Connection Board switch bank S1.
To configure Port A for RS-232 operation, set the switches as indicated in the table below (see
Figure 3-24 for switch bank locations).
Table 3-25 Port A driver settings
Board Switch Position
CPU S3-1 RS232
S3-2 RS232
S3-3 RS232
S3-4 RS232
S5-1 FULL
S6-1 RS232
S6-2 RS232
Field Connection S1-1 TERM OFF
S1-2 TERM OFF
S1-3 FULL DUPLX
S1-4 FULL DUPLX
Serial ports (Port A and Port B) have isolated and floating grounds (50 VDC isolation). Their
grounds must be connected for reliable serial port operation. A shield may be connected
to ground at the remote end and can be used to provide ground for each port. If both ports
are connected to the same remote location, the shield may be used to provide a common
ground back to the remote end.