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78 Communication settings
Section 3: Installation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
Port C Driver Configuration
Port C is provided via the Series 100 Option Board or the Series 100 Plus Option Board and can
be used for either general purpose serial communication (similar to Ports A and B) or for
optional serial communication with a Daniel Gas Chromatograph in Sim2251 mode.
The Port C driver is individually selectable between RS-232 and RS-485 Half Duplex via the
Series 100 Option Board or the Series 100 Plus Option Board (if installed) switch banks S10 and
S11 and Field Connection Board switch bank S2.
To configure Port C for RS-232 operation, set the switches as indicated in the table below (see
Figure 3-21 for switch bank locations).
To configure Port C for RS-485 Half Duplex operation, set the switches as indicated in the table
below (see Figure 3-21 for switch bank locations):
Table 3-31 Port C RS-232 settings
Board Switch Position
Option or
Series 100 Plus Option Board
S10-1 RS232
S10-2 RS232
S11-1 RS232
S11-2 RS232
Table 3-32 Port C RS-485 half duplex
Board Switch Position
Expansion Board or
Series 100 Plus Option Board
S10-1 RS485
S10-2 RS485
S11-1 RS485
S11-2 RS485
Field Connection Termination On Termination Off
S2-1 ON (toward the
outside of the board)
OFF (toward the
inside of the board)
Serial Port C has isolated and floating grounds (50 VDC isolation). Its 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 the port.
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.