Ametek 241CE II User Manual page 48

The RS-485 terminals can be configured as a 4-wire RS-485, a 2-wire RS-485, or
a 4-wire RS-422 connection. The configuration is determined by the settings of
the software and the position of the JP800 and JP801 jumpers on the Micro-
controller board (Figure 2-7) in the Electronics Enclosure. If necessary, you can
change the software settings and the jumpers to obtain the desired serial port
configuration. The jumper settings, software settings, and terminal designa-
tions are explained under "Serial Communications Configuration" below.
Figure 2-7.
Microcontroller board
(100-1181).
The configuration settings are also discussed in Chapter 3. The default serial
port configuration is RS-232. In this configuration, RS-232 serial communica-
tions will be active at the D-connector and terminal strip. Only one type of
serial port configuration can be functional at any given time.
Communication Type
RS-422
RS-485 Line Termination
RS-485 Biased High
RS-485 Biased Low
2-24 | 241CE II Hydrocarbon Dewpoint Analyzer
JP800, JP801
Serial Communications Configuration
JP800 JP801
NONE C
C C
A,B A,B
D,E D,E
PN 903-8797, Rev A