CP6100 I/O Process Programming Manual

Using CP6100: Programming
• READ delivers unsolicited messages from the protocol task to
the application. For example, in the case of a serious line
quality problem, an application might want to know, even if no
request is pending. To be sure to receive such information,
an application keeps a READ call outstanding. SOME PROTOCOLS
DO NOT SUPPORT THIS FEATURE.
S5064-006
String
Intege
r
String
Function , Like
Send Text
Modifier to
Function
Request ID , Unique for All Pending
Requests 1
< reqid < 32767
TextOut , Size of Text Field in Bytes
TextIn , Number of Bytes Expected
in Response
Response, Same
as Function
Status, OK o
r
Error Code
Request ID , Same as in Request
Reserved , Varies by Protocol
TextIn , Number of Bytes Received
Outgoing Buffer Format
(Request)
Incoming Buffer Format
(Reply)
•
•
•
•
•
•
•
•
•
•
•
•
Text , Depends on
Function and Application
Text , Depends on
Function and Application
Figure 2-2. WRITEREAD Buffer
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