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St_a_tu_s~I~1 V~II~I
INTRODUCTION
This section tells how a program executing in a host com-
puter obtains and interprets status information from the
HP 2624A.
Status requests are issued in the form of escape sequences.
There are four types of status requests:
1. Terminal ID Status. This request is the means by
which your program verifies what kind of terminal it is
communicating with.
2. Primary Terminal Status. This request returns seven
bytes that report the status of configuration straps
A-H, some of the latching keys, and various error and
pending flags.
3. Secondary Terminal Status. This request returns
seven bytes that report the status of configuration
straps J-Wand the memory lock feature.
4. Device Status. This request returns three bytes that
report the status of the integral and/or external
printers.
The escape sequence used for each of the above requests
and the format of the returned status information is
presented on the pages that follow.
All status requests are treated as block transfers. In
response to a status request, the terminal transmits an
escape sequence followed by a series of bytes followed by a
terminator. The terminator is as follows:
Character Mode:
<CR>
or
<CR><LF>
Block Line Mode:
<CR>
or
<CR><LF>
Block Page Mode:
<Bl kTermnator>
In either character mode or block line mode, the
<CR><LF>
is used if auto line feed mode is enabled. In block page
mode, the block terminator is the character specified in
the
Bl kTermnator
field of the Terminal Configuration
menu
«RS>
is the default for that field).
The type of handshaking used is determined by the setting
of the
InhHndShk(G}
and
I nh DC2(H}
fields of the Terminal
Configuration menu as follows:
InhHndShk(G}
Inh DC2(H}
InhHndShk(G}
Inh DC2(H}
-YES
}
=YES
No handshake
-NO
}
DCl
-YES or NO
InhHndShHG}
InhDC2(H}
·YES }
=1'10
INTERPRETING STATUS
DC lIDC2/DC 1
For primary, secondary, and device status requests, the
terminal returns an escape sequence followed by a string of
bytes. The status information is contained in the lower four
bits of each byte. The upper four bits are set so that the byte
translates into one of the 16 ASCII characters shown in
table
8-1.
Table
8-1.
ASCII Status Characters
ASCII CHARACTER
BINARY
0
0011 0000
1
0011 0001
2
0011 0010
3
0011 0011
4
0011 0100
5
0011 0101
6
0011 0110
7
0011 0111
8
0011 1000
9
0011 1001
0011 1010
0011 1011
<
0011 1100
=
0011 1101
>
0011 1110
?
0011 1111
For a terminal ID request, the terminal returns the
5-character ASCII string
"2624A".
TERMINAL ID STATUS
You request the terminal ID status by issuing the following
escape sequence:
<ESC>*!! [<parameter>]A
where
<parameter>,
if present, is ignored.
8-1
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