PN 903-8797, Rev A
From the “Serial Communications Conguration” table, choose the serial
interface type from the Communication Type column, then use settings in
that row to congure the jumpers and software, and to terminate the com-
munication lines.
If you choose RS-485, consider the location of the analyzer on the line. When
the analyzer is used on the end of the communication line, use the End-of-Line
(Line Termination) serial interface type. The End-of-Line conguration is the
default conguration. RS-485 communication lines are normally Biased High
(Idle High) at only one location, and the analyzer can be set for this congura-
tion with the Biased High conguration.
Two (2) connections exist for the RS-232 serial port. One is the D-sub
connector and the other is on the customer connection terminal strip,
both on the Termination board. To avoid damaging the equipment,
do not attempt to connect both at the same time.
Digital Communication Protocol
The Modicon Modbus
®
operating as a slave device is the serial communication
interface protocol used by the analyzer. This function is optional. The analyzer
responds to Modbus queries within one second.
Installation and Start-Up | 2-25
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