ACC HDLC-NRM (SDLC) User's Guide

Protocol Specific Configuration

Protocol Configuration Values

Chapter 4 53

N2 - Retransmission Limit

This is the retransmission retry limit. The default (if this parameter is

set to zero) is seven (7).

This parameter governs the number of times the protocol will attempt to

retry after an error condition, before resorting to a higher level recovery

action.

Protocol Option Word

The option word enables various options to be configured for each

terminal. Usually, these options are defined for a certain device type in

the zcomdevice.txt file (see later section on predefined device types). The

option word can be overridden for a particular terminal by use of the

Option keyword following the Terminal-Definition. Refer to the ACC

Utilities Reference Guide for further information.

Each of the individual options is controlled by a single bit flag within the

option word. The option word is configured as follows:

NSP - No Slow Poll

Set to disable the normal slow poll facility for a primary station when the

terminal is down. When set for a primary station, the station will be

polled once during each normal poll cycle, even when down. For further

discussion of the slow poll mechanism, refer to the “Response Timer”

section of Chapter 3. This option is only applicable for a primary station.

SLM - SDLC Loop Mode

Set to enable loop mode operation. Refer to Appendix B, “SDLC Loop

Mode Option.” If this option bit is set (1), then the HDX (half duplex) bit

should also be set (1), and all other option bits clear (0).

15 1

9 8 7 6 5 4 3 2 1 0

Unused (0) NS

SLM BC

HDX RP