A795 User Guide: Programming Supplement
Chapter 4: Programming commands
87
Unsolicited status mode
Select or cancel unsolicited status mode (USM)
ASCII:
GS a n
Hexadecimal:
1D 61 n
Decimal:
29 97 n
Value of n:
0 turns mode off;
any non-zero value turns mode on
Default:
0 (USM disabled)
Enables or disables automatic return of 4 status bytes
whenever one or more of the listed changes occurs. This
command is a batch mode command; that is, it is
processed after all prior data in the input buffer has been
processed. There may be a time lag between the printer
receiving this command and enabling unsolicited status
mode (USM), depending on the pending input buffer
contents.
If an immediate return of printer status is desired, then any
of the other status commands should be issued following
this command. Once this mode is activated, the printer
automatically transmits 4 status bytes whenever any of the
conditions change. If an RS-232C connection with
hardware flow control is used, all four status bytes will be
transmitted without checking DSR.
This command is a POS version of general printer
unsolicited status functions; it uses the same command
code as older versions of the POS command. “automatic
status back (ASB)” but has the following differences:
•
The parameter n is an on/off switch; it does not
select trigger subset
•
There is no immediate return when this mode is
turned on
•
All 4 status bytes are always returned
A change in any of the following conditions will trigger
the USM response:
•
Cash Drawer
•
Receipt Cover
•
Knife Error
•
Out-of-Range Printhead Temperature
•
Out-of-Range Voltage
•
Paper Exhaust Status
•
Slip Paper
Related information
When Unsolicited Status Mode is enabled using this
command, the status transmitted by other commands and
the USM status are differentiated according to the
information found in Recognizing Data from the printer,
which follows the USM return description.
The status bytes to be transmitted are described in the
following four tables.
Byte 1 = printer information
Byte 2 = error information
Byte 3 = paper sensor information
Byte 4 = paper sensor information
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