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8.3.
RS-232 Configuration
The RS-232 configuration is usually used when making a one-to-one connection between
the instrument and a single computer or PLC. The communications protocol used for the
RS-232 configuration is MODBUS RTU. For details on the MODBUS RTU
specification, please see http://www.modbus.org/.
With the instrument configured for RS-232, connection can be made to the DB-9
connector, labeled "RS232/485", or to the three "COM" pins on the "General I/O"
connector. Only one of these connections should be used, the other must be left un-
connected. Table 8-1 below details the pinouts of these two connectors:
Function
Transmit (Tx)
Receive (Rx)
Ground
A DTE-DCE switch is provided so that the instrument can be
connected to another device using either a straight-through or
crossover (Null-Modem) cable. See Section 8.2 for details on
changing this configuration.
The serial port setup for RS-232 configuration is shown in Table 8-2 below:
06160J DCN7969
Table 8-1: RS-232 Connector Details
DB-9
Connector Pin
(SW2 – DTE)
3
2
5
NOTE
Table 8-2: RS-232 Port Setup
Property
Baud Rate
Data Bits
Parity
Stop Bits
Flow Control
Teledyne API Model 465M O
DB-9
General I/O
Connector Pin
Connector
(SW2 – DCE)
2
'T'
3
'R'
5
'G'
Value
57600
8
None
1
None
Monitor User Manual
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