Envoy Application Programming Manual

BISYNC Centralized Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
4-11
Station Address
Station Address
Each entry in the address list is a station address. A station address is of the form:
address-ENQ
Each station address (including the ENQ character) must:
•
Contain exactly the address size times two byte elements.
•
Be the same size within a given address list.
•
Be padded with a leading ASCII SYN character (%026) or a trailing NUL character
(%0) if it contains an odd number of bytes. (See Example 4-2.)
Poll List
The poll list contains one entry for each station address to be polled (poll count). In a
poll list, each entry's first element has a most significant bit (MSB). That MSB is the
poll-state bit. The state of this bit indicates whether the associated station should be
polled when polling is initiated:
0 = enable polling
1 = disable polling (do not poll the station associated with this address)
Example 4-1. Address List Format
station address, entry 0
station address, entry 0
.
. poll list
.
station address, entry pn-1
station address, entry pn
station address, entry pn+1 ______________
.
.
. select list
station address, entry n-1
________________________________
Legend
entry = entry number in the address list (first entry = 0)
pn = poll count
n = number of entries in the address list
Note. It is recommended to precede the station address with an EOT. The transmission of the
EOT ensures that all monitoring stations are in the CONTROL state and are prepared to
receive a poll or select.