User's Manual

435

Chapter 8, Programming the Call Processing Subsystem

Using the Call Processing Subsystem’s Remote User Interface

Call Processing Status Register Group

See “Call Processing Status Register Group” on page 271 for a detailed description

of the Call Processing Subsystem Status Register Group.

See “Status Reporting Structure Overview” on page 239 for detailed information

on status register groups and status reporting.

Using the Call Processing Status Register Group To Control Program Flow

The Call Processing Subsystem uses annunciators to indicate its current state.

That is, if the Call Processing Subsystem is in the connected state, the

Connect

annunciator will be lit.

Bits 0 through 5 of the Condition register in the Call Processing Status Register

Group mirror the condition of the annunciators. That is, if the

Connect

annunciator is lit, bit 5 of the Condition register will be TRUE, logic 1, and all

other bits will be FALSE, logic 0.

Under most circumstances a control program will need some means of

determining the state of an interaction between the control program, the Call

Processing Subsystem and the mobile station.

For example, if the control program wishes to register a mobile station, the control

program will have to send a command to put the Call Processing subsystem into

the

Active state, then, once in the Active state, send a registration message by

putting the Call Processing Subsystem into the

determine when to read the mobile station’s registration information in order to

make a determination as to whether the mobile station registered correctly.

In the manual user interface, the annunciators supply this state information to the

operator. In the remote user interface, the Call Processing Status Register Group

supplies the state information to the control program.

The control program can access this information in one of two ways; by polling

the status registers or by using the service request feature of the HP-IB. If properly

implemented, either method can be used to obtain the information.