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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
7 RS-232 INTERFACE
The RS-232 communications protocol allows the instrument to be connected to a wide variety of
computer based equipment. The interface provides two basic functions in the M100AH.
1. First is a comprehensive command interface for operating and diagnosing the analyzer. This
interface has in fact more capabilities than the front panel keyboard.
2. The interface can provide an audit trail of analyzer events. In this function the port sends out
messages about instrument events like calibration or warning messages. If these messages are
captured on a printer or remote computer, they provide a continuous audit trail of the
analyzers operation and status.
7.1 Setting Up the RS-232 Interface
The baud rate is set from the front panel by SETUP-MORE-COMM-BAUD. Select the baud rate
appropriate for your application, 300, 1200, 2400, 4800, 9600, 19.2K. It is important to note
that the interfacing device must have identical settings in order for the communications to
work correctly.
Second is physical wiring of the analyzer to the other unit. We have incorporated into the
analyzer LED's that signal the presence of data on the communications lines, and also jumper
blocks to easily re-configure the analyzer from DCE to DTE if necessary (see drawing #01917).
In addition the front panel diagnostics allow test data streams to be sent out of the port on
command. This flexibility and diagnostic capability should simplify attaching our equipment to
other computers or printers. If problems occur, see the Section 4.3.1.2.
7.1.1 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:
7-1