Teledyne t320u Manuale Utente

Troubleshooting and Service 

Teledyne API – Model T300/T300M CO Analyzer 

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 

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 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-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” Teledyne API P/N 013500000. 

 

12.5.11.  THE OPTIONAL CO

There are Two LEDs located on the CO

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