Envoy Application Programming Manual

ADM-2 Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
7-22
Broadcast Select
If Envoy is to insert the terminal address, the message is passed to Envoy (with the
WRITE procedure) in the following form:
MCW.<5> = 0 (message formatted by Envoy)
EOT s entry no 0 STX-text-ETX
Broadcast Select
A broadcast-select function is used to display a message on a group of terminals. The
message is displayed by all address terminals regardless of whether they are busy. The
group is defined by a list of terminal addresses included in the message format.
The broadcast-select function is performed by writing a message of the form:
MCW.<6> = 1 (special-format message)
MCW.<8:15> = 0
EOT a1 a1 ta2 a2 t...an an s STX-text-ETX
If the application process inserts the terminal addresses, then the message is passed to
Envoy (with the WRITE procedure) as shown above. In this case:
MCW.<5> = 1 (message formatted by the application process)
(message length = 5 + number of terminals * 3 + text length)
If Envoy is to insert the terminal addresses, then the message is passed to Envoy (with
the WRITE procedure) in the following form:
MCW.<5> = 0 (message formatted by Envoy)
EOT t entry no 1 0t entry no 2 0 t entry no 0 0...s
entry no 0 STX-text-ETX
entry no
n
is the one-byte address-list entry number of the last terminal to receive
the message
0
is a one-byte place holder
s is a one-byte fast-select function code
a1 is the one-byte terminal address of the first terminal to receive the
message
a2 is the one-byte terminal address of the second terminal to receive the
message
an is the one-byte terminal address of the last terminal to receive the
message
r is a one-byte sequential-select function code
s is a one-byte fast-select function code