REQUEST_TO_SEND
Normally, your program remains in the receive state until the remote LU sends a change-direction indicator.
Your program can request a change of direction from the receive state to the send state by specifying OPTNS=SIGNAL on a write request. The SIGNAL option sends a change-direction signal code of X'00010000'.
If your program issues a write request while it is in the receive state, CA IDMS/DC sends the signal command, requesting change of direction, to the remote LU. CA IDMS/DC posts your program's write request as successfully completed with a logical error (R15 = 0C) and an error code in the UIOUCM2 field of the UIOCB.
The UIOUCM2 field indicates that your program tried to send data while in the receive state (UIOSCRM), and that CA IDMS/DC sent the change-direction signal for you. You must continue to send read requests until the remote LU sends a change-direction signal (UIOCD).
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