Envoy Application Programming Manual

ADM-2 Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
7-21
Fast Select
If the application process inserts the terminal addresses, then the message is passed to
Envoy (using the WRITE procedure) as shown above. In that 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 rentry no 1 or entry no 2 0... s entry no n 0
STX-text-ETX
(message length = 5 + number of terminals times 3 + text length)
Fast Select
A fast-select function is used to display a message on a terminal regardless of whether
the terminal is busy. The terminal where the message is to be displayed is specified by a
terminal address included in the message format.
The fast-select function is performed by writing a message of the form:
MCW.<6> = 1 (special-format message)
MCW.<8:15> = 0
EOT a1 a1 STX--text--ETX
a1 is the one-byte terminal address of the terminal to receive the message
s is a one-byte fast select function code
If the application process inserts the terminal address, then the message is passed to
Envoy (with the WRITE procedure) as shown above. In that case:
MCW.<5> = 1 (message formatted by the application process)
(message length = 8 + text length)
entry no
1
is the one-byte address-list entry number of the first terminal to receive
the message
entry no
2
is the one-byte address-list entry number of the second terminal to
receive the message
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