z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
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Normal data transfer (X-side)

z/OS Communications Server: SNA Diagnosis Vol 1, Techniques and Procedures
GC27-3667-00

Figure 1 shows the data areas associated with the X-side of a normal data transfer channel program.

 
 
Sequence

 
 
CCW

Command
code
(hex)

 
 
Flags

 
 
Address

 
Byte
count
1 WCTL

17/
14

 CC,SLI Zero 1
Note: WCTL is used when this host is initiating a write operation. SCB is used when this host is responding to an attention (because the other host has data that it wants this host to read).
2 Write 01 CC,SLI YCNWRIDA Number of bytes to transfer
3 Read 02 SLI YCNRDIDA Total length of Read buffer
Figure 1. Data areas used for normal data transfer (X-side)
Diagram that shows the data areas associated with the X-side of a normal data transfer channel program for nonblocking protocols.
Parent topic: Channel programs for CTC data transfer: Blocking protocol

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