Teledyne 6200T - Sulfides Analyzer - Manual (Page 256)

Troubleshooting Model 6200T Total Sulfur Analyzer
256 Teledyne Analytical Instruments
If the analyzer stops during initialization (the front panel display shows a fault or
warning message), it is likely that the DOM, the firmware or the configuration and data
files have been corrupted.
12.6.9. RS-232 Communication
This section provides general RS-232 communication information.
12.6.9.1. General RS-232 Troubleshooting
Teledyne Analytical Instruments’s analyzers use the RS-232 protocol as the standard,
serial communications protocol. RS-232 is a versatile standard, which has been used for
many years but, at times, is difficult to configure. Teledyne Analytical Instruments
conforms to the standard pin assignments in the implementation of RS-232. Problems
with RS-232 connections usually center around 4 general areas:
 Incorrect cabling and connectors. This is the most common problem. Refer
to Section 3.3.1.8 for connector, pin-out and setup information.
 The communications (baud) rate and protocol parameters are incorrectly
configured. Refer to 3.3.1.8 and 6.2 for baud rate information.
 The COMM port communications mode is set incorrectly (refer to Section
6.2.1).
 If a modem is used, additional configuration and wiring rules must be
observed. Refer to Section 8.3.
 Incorrect setting of the DTE - DCE Switch. Refer to Section 6.1.
12.6.9.2. Modem or Terminal Operation
These are the general steps for troubleshooting problems with a modem connected to a
Teledyne Analytical Instruments analyzer.
 Check cables for proper connection to the modem, terminal or computer.
 Check the correct position of the DTE/DCE switch as described in Section
6.1.
 Check the correct setup command (refer to Section 8.3).
 Verify that the Ready to Send (RTS) signal is at logic high. The 6200T sets
Pin 7 (RTS) to greater than 3 volts to enable modem transmission.
 Ensure that the baud rate, word length, and stop bit settings between modem
and analyzer match (refer to Sections 6.2.2 and 8.3).
 Use the RS-232 test function to send “w” characters to the modem, terminal
or computer. Refer to Section 6.2.3.
 Get your terminal, modem or computer to transmit data to the analyzer
(holding down the space bar is one way). The green LED on the rear panel
should flicker as the instrument is receiving data.
 Ensure that the communications software is functioning properly.
Further help with serial communications is available in a separate manual “RS-232
Manual”, Teledyne Analytical Instruments’s P/N 013500000, available online at
http://www.Teledyne-api.com/manuals/