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Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
7 RS-232 COMMUNICATIONS
The Model 300M features a powerful RS-232 interface that is used both for reporting test results
and for controlling the analyzer from a host computer. Because of the dual nature of the RS-232
interface, the message format has been carefully designed to accommodate both printers and host
computers.
Setup from the Front Panel
There are 2 additional RS-232 setups that can be done via the front panel.
1. Set the Instrument ID number by SETUP-MORE-COMM-ID, and enter a 4 digit number
from 0000-9999. This ID number is part of every message transmitted from the port.
2. Set the RS-232 mode bit field in the VARS menu. To get to the variable press, SETUP-
MORE-VARS-ENTR and scroll to RS232_MODE, then press EDIT. The possible values
are:
Table 7-1: RS-232 Port Setup - Front Panel
Decimal Value Description
1 Turns on quiet mode (messages suppressed)
2 Places analyzer in computer mode (no echo of chars)
4 Enables Security Features (Logon, Logoff)
8 Enables RS-232 menus display on M300M front panel display
16 Enables alternate protocol and setup menu
32 Enables multi-drop support for RTS
NOTE
To enter the correct value, add the decimal values of the features you
want to enable. For example if logon and front panel RS-232 menus
were desired the value entered would be 4 + 8 = 12.
All message outputs from the Model 300M have the following format:
X DDD:HH:MM IIII MESSAGE<CRLF>
The "X" is a character indicating the message type (see Table 7-2).
7-1