23: MODEM MODE
23-14 OPENNET CONTROLLER USER’S MANUAL
Troubleshooting in Modem Communication
When a start internal relay is turned on, the data of D8211/D8311 (modem mode status) changes, but the modem
does not work.
Cause: A wrong cable is used or wiring is incorrect.
Solution: Use the modem cable 1C (FC2A-KM1C).
The DTR or ER indicator on the modem does not turn on.
Cause: A wrong cable is used or wiring is incorrect.
Solution: Use the modem cable 1C (FC2A-KM1C).
When a start internal relay is turned on, the data of D8211/D8311 (modem mode status) does not change.
Cause 1: D8200/D8300 does not store 1 and the modem mode is not enabled.
Solution 1: Store 1 to D8200 or D8300 when using RS232C port 1 or port 2, respectively.
Cause 2: Communication selector DIP switch setting is wrong and the modem mode is not enabled.
Solution 2: Set communication selector DIP switch 2 or 3 to ON when using RS232C port 1 or port 2, respectively
When an initialization string is sent, a failure occurs, but sending ATZ completes successfully.
Cause: The initialization string is not valid for the modem.
Solution: Refer to the user’s manual for the modem and correct the initialization string.
When a dial command is sent, a result code “NO DIALTONE” is returned and the telephone line is not connected.
Cause 1: The modular cable is not connected.
Solution 1: Connect the modular cable to the modem.
Cause 2: The modem is used in a PBX environment.
Solution 2: Add 10 or 20 to the value stored in D8201/D8301 when using RS232C port 1 or port 2, respectively, and try
initialization again.
Dialing completes successfully, but the telephone line is disconnected in a short period of time.
Cause 1: The modem settings at the both ends of the line are different.
Solution 1: Make the same settings for the modems at the both ends.
Cause 2: The model of the modems at the both ends of the line is different.
Solution 2: Use the same modems at the both ends.
Cause 3: The quality of the telephone line is low.
Solution 3: Decrease the baud rate of the
OpenNet Controller to lower than 9600 bps.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
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