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A760 User Guide: Programming Supplement

Chapter 4: Programming commands

Revision F January 2010

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 ow 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

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 153 154

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