Epson TM-T88VI Technical Reference Manual page 127

Appendix
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.
Multi-tone printing
When performing multi-tone printing over Bluetooth, the print speed may fluctuate or intermittent printing
may occur due to data transfer conditions, also the print shade may change or white lines may occur.
Interference from Wi-Fi
2.4 GHz Wi-Fi may interfere with Bluetooth communication. Using the optional Wireless LAN cable set (OT-
WLxx) with 2.4 GHz may disrupt Bluetooth communication or printing. 5 GHz Wi-Fi is recommended when
using Wi-Fi with Bluetooth.
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 SDK User's Manual provided.
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.
The iOS application cannot receive the data sent from the printer
Situation
Although the printer sends data to the iOS device and the data is received by the iOS device, depending on the
combination of the iOS version and the iOS device, the iOS application may not be able to receive the data.
Conditions
This may occur in combinations of the following conditions.
 iOS version: 7.1, 7.1.1
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