Envoy Application Programming Manual

TINET Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
8-2
Application Process Interface
Application Process Interface
This subsection includes:
•
TINET Multipoint Supervisor Polling on page 8-3
•
TINET Multipoint Supervisor Selection on page 8-4
•
Retries on page 8-4
•
Timeouts on page 8-4
An application process, acting as the supervisor station in a TINET centralized
multipoint network, interfaces with Envoy and the terminals by way of Guardian 90 file-
system procedure calls.
Before it can transmit or receive any data, the application process must first open a
communications line for exclusive read-write access. Only the application process (and
its backup) can open the line. An application process acting as the supervisor station
must provide an address list to Envoy. The address list contains the poll address of any
stations to be polled, followed by the select addresses of those stations. You pass the
address list to Envoy by issuing a call to the DEFINELIST procedure. (See Address-List
Format on page 8-7.)
Table 8-1. TINET Multipoint Supervisor Formats
TINET Multipoint Supervisor Format
Poll terminal EOT idp
idp = terminal polling address
Read data STX id aid seq {oc -data-}...ETX LRC
id = terminal address
aid = aid byte
seq = sequence count
oc = order code
Write data (nontutorial) EOT ids STX id seq cc wcc {oc [lc ]-data-}...ETX
LRC
ids = terminal select address
cc = command code
wcc = write control character
lc = light code
Write tutorial mask EOT ids STX id seq cc wcc {lc fl }...ETX LRC
fl = field length