Envoy ACP/XF Application Programming Manual

Features Common to Bit-Synchronous Protocols
EnvoyACP/XF Application Programming Manual–132179
B-14
Nonreserved Responses
Your application directs EnvoyACP/XF to transmit an RD response by issuing a
CONTROL 18 procedure (see the CONTROL procedure in Section 4, System Procedure
Call Specifics for EnvoyACP/XF).
Nonreserved Responses
Your application can use four nonreserved responses to reply to the four nonreserved
commands. These nonreserved command/responses allow you to implement your own
particular, system-dependent functions. EnvoyACP/XF allows you to specify these
nonreserved responses by specifying the appropriate value in the first octet of the MCW
with a WRITE or WRITEREAD procedure call. However, you must coordinate this
implementation between the stations involved in the communications.