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TROUBLESHOOTING & REPAIR PROCEDURES
Model 300E Carbon Monoxide Analyzer
Instruction Manual
216
P/N 04288 Rev: A
11.5.9.2. Troubleshooting Analyzer/Modem or Terminal
Operation
These are the general steps for troubleshooting problems with a modem connected
to a T-API analyzer.
§
Check Cables for proper connection to the modem, terminal or computer.
§
Check to make sure the DTE-DCE is in the correct position as described in
Section 7.7.2.
§
Check to make sure the Set up command is correct (See Section 7.7.10)
§
Verify that the Ready to Send (RTS) signal is at logic high. The M300E sets
pin 7 (RTS) to greater than 3 volts to enable modem transmission.
§
Make sure the BAUD rate, word length, and stop bit settings between modem
and analyzer match, see Section 7.7.
§
Use the RS-232 test function to send “w” characters to the modem, terminal
or computer; See Section 7.7.7.
§
Get your terminal, modem or computer to transmit data to the analyzer
(holding down the space bar is one way); the green LED should flicker as the
instrument is receiving data.
§
Make sure that the communications software or Terminal emulation software
is functioning properly.
Further help with serial communications is available in a separate manual “RS-232
Programming Notes” T-API part number 013500000.
11.6. Repair Procedures
This section contains procedures that might need to be performed on rare occasions
when a major component of the analyzer requires repair or replacement.