Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 280)

Troubleshooting and ServiceTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 280
12.5.10.2. TROUBLESHOOTING ANALYZER/MODEM OR TERMINAL OPERATION
These are the general steps for troubleshooting problems with a modem connected to a
TAI analyzer.
1. Check cables for proper connection to the modem, terminal or computer.
2. Check to make sure the DTE-DCE is in the correct position as described in Section
6.1.
3. Check to make sure the set up command is correct. See Section 8.3.
4. Verify that the Ready to Send (RTS) signal is at logic high. The
GFC7001T/GFC7001TM sets pin 7 (RTS) to greater than 3 volts to enable modem
transmission.
5. Make sure the BAUD rate, word length, and stop bit settings between modem and
analyzer match. See Section 8.3.
6. Use the RS-232 test function to send “w” characters to the modem, terminal or
computer. See Section 8.3.
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.
8. 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” TAI P/N 013500000.
12.5.11. THE OPTIONAL CO
2
SENSOR
There are Two LEDs located on the CO
2
sensor PCA.
Figure 12-13: Location of Diagnostic LEDs onCO
2
Sensor PCA
 Normal Operation: V8 is not lit – V9 is Blinking
 Error State: Both LEDs are blinking.
Check to make sure that the cable to the CO
2
probe is properly connected.