Define the Post Connection Delay for a PSTN Pager Channel

Each PSTN Pager Channel has a Post Connection Delay property that you can use to define how long the Pager Driver will wait between the modems reporting that a connection has been made and sending an 'establish' message.

When a message is to be sent from Geo SCADA Expert to a pager device or mobile telephone, the Pager Driver initializes the local modem, and then the local modem and remote modem establish a connection. Once the connection has been established, the Pager Driver waits for the Post Connection Delay, before sending an 'establish' message to the paging service. The Post Connection Delay is normally only used when GSM modems are used, as GSM modems are known to experience lag during the initial connection being reported and the actual connection being available (even though the connection between the local and remote modem appears to be healthy). By adding an extra delay (the Post Connection Delay), the Pager Driver can avoid the problems that can be caused by the initial lag (which include messages and replies being out of sync).

The Post Connection Delay property is set to 0 by default. This means that it is not used. If you are using GSM modems, you may need to enable the Post Connection Delay by entering or choosing a suitable time delay. The amount of time you need to enter varies according to the type of GSM modems being used. We recommend that you begin by using a setting of 2 seconds and then use the I/O log for the Pager Channel to determine whether this needs to be increased.

To define the Post Connection Delay for a PSTN Pager Channel:

1. Display the Pager Channel Form.
2. Select the Channel tab.
3. Either:
   • Use the browse button feature of the Post Connection Delay field to define the amount of time that the Pager Driver will wait between detecting the connection between modems has been made and sending the 'establish' message.

     Or:

   • In the Post Connection Delay field, enter the amount of time that the Pager Driver will wait between detecting the connection between modems has been made and sending the 'establish' message. You need to enter the time in the OPC Time Format, for example, 2S for 2 seconds.

When you have defined the appropriate Post Connection Delay setting, you can either proceed with the Pager Channel configuration (see Configure a PSTN Pager Channel), or you can save the configuration (see Saving Configuration Changes in the Geo SCADA Expert Guide to Core Configuration).

Further Information

Logging and Monitoring in the Geo SCADA Expert Guide to Server Administration.