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Comli driver and alarms from MJK Data Transmitter 795

Question

How do I configure the Comli driver to handle alarm call-ins from the MJK Data Transmitter 795?

Answer

When an alarm situation arises in the MJK Data Transmitter, it will attempt to call the IGSS32 PC via modem. When the incoming call has been picked up by the PC, IGSS32 should be able to identify the remote MJK Data Transmitter by reading its node number from register 20. After IGSS32 has scanned all data and is ready to terminate the call, the I/O-bit number 102 (octal) should be set to zero by IGSS32 to tell the MJK Data Transmitter that the alarm call has been handled. (See below.)

To properly configure, you must enter the IGSS32 Driver Setup program and do the following tasks.

  1. Choose the General Comli 31 protocol driver, which is also identified with the acronym 7TCML, and then choose a serial interface for it.
  2. With the serial interface selected (COM1) in the left pane, find the Connection Type tab in the right pane. Under Scheduled Connection, make sure you select the option next to the telephone icon called The PC and the PLC are connected via a modem. The "COM1" name in the left pane changes to the name "Modem 0" (This change appears only after clicking away from "COM1" and then coming back to it).
  3. Now go to the Remote tab at the device level (the modem) for the Comli driver, which is identified by IGSS with the acronym 7TCML. In the first group, check Read Node Number from PLC and enter the following values: Physical Node Number: 1 Data Group: 50 ("Request register value") Word Offset: 1044 (equals register 20). In the second group Indication of Successful Call Handling enter the following values: Data Group: 51 ("Write status for one I/O-bit") Word Offset: 66 (equals I/O-bit 102 octal) Write this value when completed: 0 
Now you should be able to receive alarms correctly from the MJK device.