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Appendix D
D.1
About Updating the Maintenance Counter
This printer has a maintenance counter with functions as described in the command description for GS g 0 and
GS g 2.
The values of the maintenance counter are automatically stored in the NV memory every 2 minutes (or 4
minutes maximum) when the printer is operating, except in the power save mode.
However, if the power off is performed as described in Section D.2, the printer stores the latest values of the
maintenance counter and executes the power off control, regardless of the updating interval described above.
If the printer is not sending/receiving data or is not operating while the power is turned on, the printer enters
the power-saving mode.
D.2
Printer Power-off Procedures
If turning the power off without using the power switch, we recommend doing so after executing the power-off
sequence command DLE DC4 (fn = 2).
The following is an example of the printer power off process when the printer is turned off using the DLE DC4
(fn = 2) command.
Step 1:
The host computer transmits the following continuous procedure before the system is turned off:
(1) Executes GS ( D pL pH m a b (pL=3, pH =0, m =20, a =2, b =1)
(2) Executes GS r n (n =1)
Step 2:
The host computer waits for the paper sensor status sent from the printer in response to the GS r n
command.
Step 3:
The host computer transmits DLE DC4 fn a b (fn = 2, a = 1, b = 8).
Step 4:
The host computer waits for the power-off notice.
Step 5:
After receiving the power-off notice, wait one second or longer, then turn off the power.
Notes:
The power-off sequence is performed within approximately 5 seconds after DLE DC4 fn a b is sent, and then the
power-off notice is sent. After that, the printer enters power-off standby.
If the power-off notice is not confirmed, wait for at least 5 seconds after transmitting DLE DC4 fn a b. At this
time, the printer has only performed software processing, and the power is not turned off.
Do not reset the printer until you have confirmed the power-off notice after transmitting DLE DC4 (fn = 2).
NOTES ON UPDATING THE MAINTENANCE COUNTER AND TURNING
THE PRINTER'S POWER OFF
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