Envoy Application Programming Manual

TINET Multipoint Supervisor Protocol
Envoy Application Programming Manual—427159-001
8-25
CONTROL Procedure (Send EOT)
CONTROL Procedure (Send EOT)
The EOT sequence is used to reset the line following a READ error. You can send the
EOT sequence by calling the CONTROL procedure and specifying operation 13
(Example 8-12
).
CONTROL Procedure (Send ENQ)
An ENQ is sent to the transmitting terminal in response to an error 173 (transmission
error) on a READ. The receipt of the ENQ by the terminal causes the terminal to clear
itself (thereby destroying the data just entered) and enter the RE-ENTER mode. You can
send the ENQ sequence by calling the CONTROL procedure and specifying operation
14 (Example 8-13).
CONTROL Procedure (Send CAN)
A CAN (cancel) sequence is sent to the transmitting terminal in response to an error 173
(transmission error) on a READ. The receipt of the CAN by the terminal causes the
terminal to retain the data just entered. The terminal sends the data the next time it is
polled. You can send the CAN sequence by calling the CONTROL procedure and
specifying operation 15 (Example 8-14
).
Example 8-12. CONTROL Procedure (Send EOT)
CALL CONTROL (fnum,13)
| EOT -->
(CONTROL completes)
error = 0
Example 8-13. CONTROL Procedure (Send ENQ)
CALL CONTROL (fnum,14)
| ENQ -->
(CONTROL completes)
error = 0
Example 8-14. CONTROL Procedure (Send CAN)
CALL CONTROL (fnum,15)
| CAN -->
(CONTROL completes)
error = 0