Intermec VT220/ANSI - Reports

SECTION 8 " Programming
VT220/ANSI Terminal Emulation Programmer’s Reference Guide 8-43
Reports
The wireless station sends reports in response to host com-
puter requests. Reports provide identification (type of ter-
minal). Two categories of reports are available: primary
and secondary device attributes, and device status reports.
Device Attributes (DA)
Table 8-27 shows the action taken by the wireless station
when it receives primary and secondary device attribute
exchanges. During a primary exchange, the host asks for
the wireless station’s service class code. The wireless sta-
tion responds with “I am a service class 2 terminal.” Dur-
ing a secondary exchange the wireless station responds
with “I am a VT220 (identification code of 1) family termi-
nal.”
Table 8-27
Device Attributes
Communication
DA
Exchange Sequence Meaning
Host to VT220
(request)
Primary CSI c or
CSI 0 c
“What is your service code and
what are your attributes?”
(
r
e
q
u
e
s
t
)
Secondary CSI > c or
CSI > 0 c
“What type of terminal are you,
what is your firmware version,
what hardware options do you
have installed?”
VT220 to host
(
r
e
s
p
o
n
s
e
)
Primary CSI ? Pv;¼Pvc CSI ? 62 c (I am a VT220).
V
T
2
2
0
t
o
h
o
s
t
(
r
e
s
p
o
n
s
e
)
Secondary CSI > l; Py; Po c CSI > 1 c (I am a VT220).