TN3270 Server Manual

CRT Communication Protocol
TN3270 Server Manual—424097-001
5-2
Message Format for Inbound Data
Message Format for Inbound Data
For inbound data, as shown in Figure 5-2, the buffer returned to the application contains
the complete data message, starting with the Attention ID (AID) character, as it was
received from the client. Communications characters are stripped. A single buffer is
returned to the application.
AM3270 Mode
The Guardian TN3270 Server runs in AM3270 mode by default. The following file
system procedures are recognized by the TN32SERV/CRT protocol when it is operating
in AM3270 mode:
All file system procedures are documented in the Guardian Procedure Calls Reference
Manual. A subset of these file system proceduresthose with special significance in the
TN32SERV/CRT protocolis described next.
•
CONTROL 22 operation
•
READ[x] request procedure
•
SETMODE function 59 procedure
•
WRITE[x] request procedure
Figure 5-2. CRT Protocol Message Format for Inbound Data
AWAITIO CONTROL OPEN WRITE[x]
CANCEL DEVICEINFO READ[x]
CLOSE FILEINFO SETMODE
007CDT .CDD
Count Read
Length #1 + Length #2
Telnet
Specific
Length #1
Length #2
E
O
R
I
A
C
Screen
Information
(Part 2)
Screen
Information
(Part 1)
A
I
D