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357BRemote Operation Of The M400E M400E Ozone Analyzer Operator’s Manual
8.1.2. COMM PORT DEFAULT SETTINGS AND CONNECTOR PIN
ASSIGNMENTS
Received from the factory, the analyzer is set up to emulate an RS-232 DCE device.
RS-232 (COM1): RS-232 (fixed) DB-9 male connector.
o
Baud rate: 19200 bits per second (baud).
o
Data Bits: 8 data bits with 1 stop bit.
o
Parity: None.
COM2: RS-232 (configurable to RS 485), DB-9 female connector.
o
Baud rate: 115000 bits per second (baud).
o
Data Bits: 8 data bits with 1 stop bit.
o
Parity: None.
Male DB-9 (RS-232)
(As seen from outside analyzer)
(DTE mode)
(DCE mode)
1 2 3 4 5
6 7 8 9
RXD
GND
TXD
CTS
RTS
1 2 3 4 5
6 7 8 9
TXD
GND
RXD
RTS
CTS
Female DB-9 (COM2)
(As seen from outside analyzer)
(DTE mode)
1 234 5
6 789
RXD
GND
TXD
CTS
RTS
Figure 8-1: Default Pin Assignments for Back Panel COMM Port connectors (RS-232 DCE & DTE)
The signals from these two connectors are routed from the motherboard via a wiring harness to two 10-pin
connectors on the CPU card, CN3 (COM1) and CN4 (COM2).
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