11
3.5 Indicator and Buzzer
There are three indicators -
【
POWER
】、【
BULETOOTH
】
and
【
ERROR
】
.
【
POWER
】
indicator is red or green,
【
BLUETOOTH
】
indicator is blue and
【
ERROR
】
indicators is red. The below are the meanings of indicators:
【
ERROR
】
indicator
Constant on red lighting:
printer out of paper
Red light flashing (twice):
it constants on lighting for 5s after flashing twice, ,
this means over-voltage.
Red light flashing (once in 500ms):
red light constants 500ms, then turn off
500ms, this means the printing head
over-heating.
【
BLUETOOTH
】
indicator
Blue light flashing:
Bluetooth has been connected
Blue light off:
Bluetooth disconnected
【
POWER
】
indicator
Green light constant on:
printer is power on and in normal status
Red light constant on:
power of battery is low
There is also a buzzer to indicate various status of the printer. The meanings
are as below:
One low one high:
power on;
One high one low
: power off or under-voltage seriously, printer switches itself
off in the sleeping mode.
Circulation continuous two highs:
printer at error status
Chapter 4 Other Information
4.1 Command Programming Manual
<T11/L21 printer developing manual> is the technical manual for engineer to
develop printer Application. If need, pls contact with our company.
This manual includes the hardware interface (Serial interface, Bluetooth, USB
interface) technical description, the technical documentation of printing control
command set, and others such as how to print black mark and locate by it.
4.2 Description of Pre-printed Black Mark
If users use pre-printed black mark to locate the receipt, please be sure to
