Envoy Application Programming Manual

TINET Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
8-8
Station Address
Station Address
An address list consists of a poll list followed by a select list (Example 8-1).
Poll List
The poll list contains one entry for each terminal to be polled (poll count). The most
significant bit of the first element of each entry in the poll list is the poll state bit. The
state of this bit indicates whether or not the associated terminal should be polled when
polling is initiated:
0 = enable polling
1 = disable polling (do not poll the terminal associated with this address)
The range of poll list terminal addresses (idp) is %040 - %057 and %140 - %157.
Select List
The select list immediately follows the poll list in the address list. It contains one entry
for each terminal that may be selected (number of entries minus the poll count). The
entries in the select list must correspond exactly to the entries in the poll list.
The range of select list terminal (ids) addresses is %060 - %077 and %160 - %177. For a
given terminal, ids = idp + %020.
Example 8-2
shows how to build an address list:
Example 8-1. Address List
EOT EOT idp, entry 0 ENQ
EOT EOT idp, entry 0 ENQ
.
. poll list
.
EOT EOT idp, entry pn-1 ENQ
EOT ids, entry pn NUL NUL
EOT ids, entry pn+1 NUL NUL ______________
.
.
. select list
EOT ids, entry p-1 NUL NUL
________________________________
Legend
idp = a terminal address in the poll list (one byte)
ids = a terminal address in the select list (one byte)
entry = entry number in the address list (first entry = 0)
pn = poll count
n = number of entries in the address list