Samsung Bixolon SRP-500 Command Manual page 26

[Notes]
ASB(Automatic Status Back) transmits the status such as ink near-end, ink cartridge
installed/not installed automatically to the printer in real-time. It is called [ASB function]
and the status is [ASB status]. If you use ASB, application can acquire the printer
change in real-time and passively.
Enabling any status (except n =0) starts ASB. Then the current ASB status is
transmitted. After that, when ASB is active, the selected enabled ASB status is
transmitted each time the status changes.
When n = 0, ASB is disabled. During ASB is disabled, ASB status is not transmitted.
ASB status for ink is 4-byte, consisting of [header + status A + status B + NUL].
Header is [Hexadecimal = 35H/Decimal = 53]
Status A :
Bit
Ink near-end not detected (1
0
Ink near-end detected (1
Ink end not detected (1
1
Ink end detected (1
Ink cartridge installed (1
2
Ink cartridge not installed (1
Ink cartridge installed (2
3
Ink cartridge not installed (2
4 Reserved
Cleaning is not being performed
5
Cleaning is being performed
6 Fixed
7 Fixed
Status B :
Bit
Ink near-end not detected (2
0
Ink near-end detected (2
Ink end not detected (2
1
Ink end detected (2
2~5 Reserved
6 Fixed
7 Fixed
ASB is enabled if any status item is selected. The printer transmits a 4-byte status
when this command is executed. The printer automatically transmits a 4-byte status
message whenever the status changes. Each status represents the current status.
Bit
0 Online/offline status of ink mechanism
1 Ink detection status
Rev. 1.00
Function
st
color)
st
color)
st
color)
st
color)
st
color)
st
color)
nd
color)
nd
color)
Function
nd
color)
nd
color)
nd
color)
nd
color)
n
Status
Binary
0
1
0
1
0
1
0
1
-
0
1
1
0
Binary
0
1
0
1
-
1
0
ASB status
Detect ink end
Detect ink cartridge
Cleaning
Detect ink near-end
Detect ink end
Detect ink cartridge
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SRP-500
Hexadecimal Decimal
00
01
00
02
00
04
00
08
-
00
20
40
00
Hexadecimal Decimal
00
01
00
02
-
40
00
ASB status
Bit
Status A: Bit 1
Status A: Bit 2
Status A: Bit 5
Status A: Bit 0
Status A: Bit 1
Status A: Bit 2
0
1
0
2
0
4
0
8
-
0
32
64
0
0
1
0
2
-
64
0