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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
Register state and then
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.