Teledyne 100AH instruction manual Setting Up the RS-232 Interface, Setup from the Front Panel

Teledyne API Model 100AH SO2 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.

7.1Setting 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:

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