SNAX/APC Application Programming Manual

Application Prototype Simulator

SNAX/APC Application Programming Manual—138786

4-33

REQUEST-TO-SEND (F6)

The REQUEST-TO-SEND verb informs the partner TP that the local TP (APS) requests

to enter the Send state. The local TP does not enter the Send state until the partner TP

changes its own state to the Receive state by issuing a RECEIVE-AND-WAIT verb (or

any other verb that causes the partner TP to enter the Receive state). The REQUEST-

TO-SEND verb completes immediately; it does not wait for the partner TP to change its

state to the Receive state.

After issuing the REQUEST-TO-SEND verb, the local TP should continue issuing

RECEIVE-AND-WAIT verbs (or RECEIVE-IMMEDIATE verbs) until the Data Type

field (WHAT-RECEIVED) in the reply returns SEND or CONFIRM-SEND, which

indicates that the partner TP has changed to the Receive state. After receiving

notification of the partner’s state change, the local TP can begin sending data to the

partner TP. Note that the partner TP can remain in the Send state indefinitely after

receiving the REQUEST-TO-SEND notification from the local TP.

Request Fields

The request field for the REQUEST-TO-SEND verb screen has no operator input.

Reply Fields

IPC Return Code

displays the value of HEADER-RETURN-CODE returned in the IPC header reply.

IPC Return Code Detail

displays the value of HEADER-RETURN-CODE-DETAIL returned in the IPC

header reply.

SNAX/APC Application Prototype Simulator (APS) System (T9096D30 15FEB95 21c)

Request: Request_To_Send Resource ID: 1 0 0 1 0 0

Reply: Request_To_Send

IPC Return Code: 0 IPC Ok

IPC Return Code Detail: 0 IPC Ok

UOWs In: 0001 UOWs Out: 0001

Header Return Code: 0 RC Ok

Request Completed

F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15 F16

TPR Aloc Deal TPE R&W RTS SD SE Cnf Cnfd GA Send Prnt Hex Rcov Exit

ActS Dact PRcv RcvI Flsh Gtyp GTP A(T) E(T) Exit