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active call back action. When X0 is pressed, the active call back command code
register D3950 will be set to 3359H, which will execute the active call back. In
addition, the status of register D3951 can be used to monitor the operation
execution of the call back. In the example, when the connection is successful, Y1 will
be ON. When connection failed, Y2 or Y3 will be ON. When connection is terminated,
D3951 must be set to 0 in order to accept the new call back request command.
Step 4, confirm connection request
After the workstation sent out the active call back command, the connection request
information will be displayed at the maintenance center. At this time, the
maintenance center can decide whether to establish the connection with the
workstation and start up the application program.
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