ACC HDLC-NRM (SDLC) User's Guide

Chapter 4 53
Protocol Specific Configuration
Protocol Configuration Values
messages).
For a line configured for secondary operation, a se condary broadcast
terminal may be configured to allow the reception of any broadcast
messages sent by the primary control station. In this implementation,
the secondary broadcast terminal only will receive broadcasts, and not
any of the other secondary stations.
For operation with the broadcast facility, a terminal ZLU should be
configured with the all stations address “11111111”, (0xFF) in addition
totherealterminals.Messagestobebroadcastshouldbesenttothis
virtual terminal ZLU by an application program. On the secondary line,
all broadcast messages will be received by the secondary broadcast
terminal.
The virtual broadcast terminal is distinguished by this BCT option
setting which will change the way in which this terminal will be handled
by the protocol as follows:
•NoRPC
•NoSNRM
• No polling
A broadcast message will be sent as an unnumbered information (UI)
command with P bit s et to zero (0). No response is expected to the
broadcast message from any secondary station.
RTS - Controlled RTS
This option flag may be set to enable the control of the RTS signal as
framesaretransmitted.Thisoptionmustbesetthesameforall
terminals on the port.
If set to zero, the RTS control signal is left permanently ON after the
port is enabled.