Epson TM-P20 Technical Reference Manual page 98

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 com-
puter commands printing. This pause is the time required for processing the connection between the host com-
puter and the printer.
After opening the port, leave an interval of 300 msec or more before sending data to the port.
Timing to shut the connection off
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 Android devices
 The printer cannot connect to Android 2.3 and 2.3.2.
 When communicating with Android 2.3.3 or later versions, communicate through an insecure 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.
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