Epson TM-T88VI - RS-232 Serial Interface

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 iOS device: iPhone 5s, iPhone 5c, iPhone 5, iPad Air, iPad mini 3, iPad (4th generation), iPad mini, iPod
touch (5th generation), iPhone 4s, iPad (3rd generation), iPad 2
 Application processing: If the Bluetooth port is closed and then reopened while the application is running.
Solution
The solution differs depending on the iOS device being used. See the following table.
RS-232 Serial Interface
Interface board specifications (RS-232-compliant)
iOS Device Solution
iPhone 4s
iPad (3rd generation)
iPad 2
This situation can be avoided by using the Epson ePOS SDK for iOS.
Item Specifications
Data transfer method Serial
Synchronization Asynchronous
Handshake Select one of the following with DIP switch 1-3:
 DTR/DSR  XON/XOFF
Signal level MARK -3V to -15V logic “1”/OFF
SPACE +3V to +15V logic “0”/ON
Bit length Select one of the following with DIP switch 1-4:
 7 bit  8 bit
Transmission speed
[bps: bits per second]
 Select one of the following with DIP switch 1-7/1-8:
4800/9600/19200/38400 bps
 Select one of the following with commands:
2400/4800/9600/19200/38400/57600/115200 bps
Parity check Select one of the following with DIP switch 1-5:
 Yes  No
Parity selection Select one of the following with DIP switch 1-6:
 Even  Odd
Stop bit 1 or more bits
However, the stop bit for data transfer from the printer is fixed to 1 bit.
Connector Printer side DSUB 25-pin (female) connector