76
Appendix
• Device B signals it is ready by pulling down the Ready signal. This must remain
low for at least 50 ms. When the Ready signal is pulled up while the printer is
printing, the printer will pause and behave exactly the same way as if the user
presses the Pause button on the control panel. The printer remains in Pause
mode until the Ready signal is pulled down again for at least 50ms.
• The printer prints and pulls up the signal when printing is completed.
• No printing occurs whenever the Printer Error signal is pulled low.
Figure
11
Timing
Diagram
Table
7
GPIO
Pin
Assignment
(D
‐
sub
9
‐
pin
Connector)
Pin
Signal
Description
1
HIGH
(3.3
V)
2
ADC
5
3
job
ready
(output)
(GPIO
A25)
4
External
device
ready
(input)
(GPIO
D04)
5
Printer
error
(output)
(GPIO
D08)
6
LOW
(0
V)
7
NC