AM3270/TR3271 Reference Manual

AM3270 Product Environment
A Closer Look at AM3270
086705 Tandem Computers Incorporated 3–9
Figure 3-6. WRITE Operation
Decode Status
and Report the
Error Number
to the
Application
Specific Poll
Subdevice for
Status
?
Err=173
no
retry
yes
1
NAK
WACK
RVI
No Response
(Timeout)
011
Err=172
Err=0 Err=172
Subdevice will
now be busy
until operation
is complete at
the device.
CALL WRITE
1
*
*2
send
select message
wait for
response
4 *
wait for response
send text
3
Err=173
?
no
yes
retry
Err=171
?
no
yes
retry
4 Send [ENQ]
ACK0
ACK1
[EOT]
Text
Text w/Err
No No No No No
yes yes yes
NAK WACK RVI ACK0 EOTTimeout
Send [EOT]
Send [EOT]
Send [EOT]
Send [EOT]
Send [EOT]
yes
Send [EOT]
*
Err=163
6
Err=0
Err=0
?
5
no
yes
retry
Err=171
1
6
?
yes
no
Send [EOT]
3
More text
to send?
ACK1