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Troubleshooting and Service Teledyne API – Model T300/T300M CO Analyzer
288
12.5.10.2. TROUBLESHOOTING ANALYZER/MODEM OR TERMINAL OPERATION
These are the general steps for troubleshooting problems with a modem connected to a
Teledyne API 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. Che
ck to make sure the set up command is correct. See Section 8.3.
4. Verify that th
e Ready to Send (RTS) signal is at logic high. The T300/T300M 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-2
32 test function to send “w” characters to the modem, terminal or
computer. See Section 8.3.
7. Get your term
inal, 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” Teledyne API 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.
06864B DCN6314