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SECTION 8
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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?”
(request)
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
(response)
Primary
CSI ? Pv;
¼
Pvc
CSI ? 62 c (I am a VT220).
VT220 to host
(response)
Secondary
CSI > l; Py; Po c CSI > 1 c (I am a VT220).
Содержание VT220/ANSI
Страница 1: ...VT220 ANSI Terminal Emulation PROGRAMMER S REFERENCE GUIDE P N 977 047 037 Revision C July 1998...
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Страница 18: ...CONTENTS xiv VT220 ANSI Terminal Emulation Programmer s Reference Guide...
Страница 26: ...SECTION 1 Introduction 1 8 VT220 ANSI Terminal Emulation Programmer s Reference Guide...
Страница 80: ...SECTION 4 RT1700 Radio Terminal 4 22 VT220 ANSI Terminal Emulation Programmer s Reference Guide...
Страница 144: ...SECTION 8 Programming 8 8 VT220 ANSI Terminal Emulation Programmer s Reference Guide Table 8 3 C1 Control Characters...
Страница 264: ...APPENDIX A Bar Code Scanning A 4 VT220 ANSI Terminal Emulation Programmer s Reference Guide...
Страница 276: ...INDEX Index 12 VT220 ANSI Terminal Emulation Programmer s Reference Guide...