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Publication 1763-RM001B-EN-P - April 2007

Communications Instructions 359

Communication

Servicing Selection and

Message Servicing

Selection

The following screen shows the channel configuration window for

Communication Servicing Selection and Message Servicing Selection.

Communication Servicing Selection

Use the check box to enhance communication capability. If the check box

is unchecked, communication throughput (and scan time) will increase.

When Communications Servicing Selection is checked, at the next

execution of a Service Communications (SVC) instruction, I/O Refresh

(REF) instruction, or when it performs Communications Servicing,

whichever occurs first, commands/replies are processed as follows:

• One incoming channel 0 or channel 1 command;

• One incoming channel 0 or channel 1 message reply;

• One outgoing channel 0 or channel 1 message on the overflow

queue.

When the Communications Servicing Selection bit is unchecked, at the

next execution of a Service Communications (SVC) instruction, I/O

Refresh (REF) instruction, or when it performs Communications Servicing,

whichever occurs first, commands/replies are processed as follows:

• One incoming channel 0 or channel 1 command;

• (conditional) If the Message Servicing Selection is clear (not

checked) first, all incoming channel 0 or channel 1 message replies;

then all outgoing channel 0 or channel 1 messages on the overflow

queue. If the Message Servicing Selection is set (checked), First the

incoming channel 0 or channel 1 message reply; then one outgoing

channel 0 or channel 1 message on the overflow queue.

• All remaining incoming channel 0 or channel 1 commands.

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