Epson Mobilink TM-P20II Technical Reference Manual page 108

Notes on use
Time required until printing starts
• If the host computer and the printer are not connected on a continuous basis but rather connected every time
the printer starts printing, some time may be needed for the printer to actually start printing after the host
computer commands printing. This pause is the time required for processing the connection between the
host computer and the printer.
After opening the port, leave an interval of 300 msec or more before sending data to the port.
• After turning on the printer, wait until the initialization process is complete (about 40 seconds) before
printing or making settings via Bluetooth.
Timing to shut the connection off
Even if data transfer from the application on the host computer has already been completed, the data may
remain in the printer's internal buffer. Since data remaining in the buffer may be discarded when the
connection is disconnected, when disconnecting the wireless connection immediately after printing, use status
or other means to confirm that the transmitted data has been printed reliably.
If a connection between the host computer and the printer is shut off while the printer is offline, it may not be
re-established. In this case, first clear the printer offline causes, and then try to re-establish the connection.
Notes when communicating with iOS devices
Print data deletion and Bluetooth disconnections occur
Situation
Depending on the specifications of the iOS device, print data sent to the printer may be deleted. When this
occurs, the Bluetooth connection between the printer and the iOS device is disconnected.
Conditions
This occurs when the printer is not ready to print, and 64 KB or more of print data is sent to the printer.
<Status in which the printer cannot print>
• When the roll paper cover is open
• When the paper is out
Solution
Do not send data to the printer if the printer is not ready to print.
For developers using the SDK from Epson, see the User's Manual - Chapter 3 Programming Guide - "Printing
After Checking the Printer Status".
Since Bluetooth is disconnected when this occurs, if the auto reconnect feature is not enabled, you need to
reconnect from the Bluetooth settings screen on the iOS device.
When using the SDK from Epson, this connection process is not necessary.
Appendix
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