LK-T21 Technical Manual
·HRI characters for the control character (<00>H to <1F>H and <7F>H)are
space.
<Others> Be sure to keep spaces on both right and left sides of a bar code.
(Spaces are different depending on the types of the bar code.)
[Reference] GS H, GS f, GS h, GS w
GS r n
[Name] Transmit status
[Format] ASCII GS r n
Hex 1D 72 n
Decimal 29 114 n
[Range] n=1, 2, 49, 50
[Description] Transmits the status specified by n as follows:
n Function
1,49 Transmits paper sensor status
2,50 Transmits drawer kick-out connector status
[Details] ·When using a serial interface
·When DTR/DSR control is selected, the printer transmits only 1 byte after confirming the host
is ready to receive data (DSR signal is SPACE). If the host computer is not ready to receive
data (DSR signal is MARK), the printer waits until the host is ready.
When XON/XOFF control is selected, the printer transmits only 1 byte without confirming
the condition of the DSR signal.
·This command is executed when the data in the receive buffer is developed. Therefore, there
may be a time lag between receiving this command and transmitting the status, depending
on the receive buffer status.
·When Auto Status Back (ASB) is enabled using GS a, the status transmitted by GS r and the
ASB status must be differentiated using the table in Appendix G.
·The status types to be transmitted are shown below:
Paper sensor status ( n = 1, 49):
Bit Off / On Hex Decimal Status for ASB
Off 00 0 Paper roll near-end sensor: paper adequate.
0,1
On 03 3 Paper roll near-end sensor: paper near end.
Off 00 0 Paper roll end sensor: paper adequate.
2,3
On (0C) (12) Paper roll end sensor: paper near end.
4 Off 00 0 Not used. Fixed to Off.
5,6 - - - Undefined.
7 Off 00 0 Not used. Fixed to Off.
Bits 2 and 3: When the paper end sensor detects a paper end, the printer goes off-line and does not
execute this command. Therefore, bits 2 and 3 do not transmit the status of paper end.
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