TSC TTP-244M Pro - Page 20

19
TTP-244M Pro/244ME Pro
TTP-342M Pro/342ME Pro
Bar Code Printer Service Manual
Centronics
Pin
SPP Mode
Nibble
In/Out
Function
1
Strobe
N/A
In
A low on this line indicates that there are valid
data at the host. When this pin is de-asserted,
the +ve clock edge should be used to shift the
data into the device.
2-9
Data 0-7
N/A
In
Data Bus. Single-directional.
10
Ack
N/A
Out
A low on this line indicates that there are valid
data at the Device. When this pin is
de-asserted, the +ve clock edge should be
used to shift the data into the host.
11
Busy
N/A
Out
When in reverse direction, a high indicates
data, while a low indicates a command cycle. In
forward direction, it functions as PtrBusy.
12
Paper Out /
End
N/A
Out
When low, device acknowledges reverse
request.
13
Select
N/A
Out
Extensibility flag
14
Ground
N/A
GND
15
No Defined
N/A
N/A
16-17
Ground
N/A
GND
Ground
18
No Defined
N/A
N/A
19-30
Ground
N/A
GND
Ground
31
No Defined
N/A
N/A
32
Error / Fault
N/A
Out
A low set by the device indicates that the
reverse data is available
33-35
Ground
N/A
GND
Ground
36
No Defined
N/A
N/A