Rs-232 Serial Interface - Epson TM-T88VI Technical Reference Manual

 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.
iOS Device
iPhone 4s
iPad (3rd generation)
iPad 2

RS-232 Serial Interface

Interface board specifications (RS-232-compliant)
Item
Data transfer method
Synchronization
Handshake
Signal level MARK
SPACE
Bit length
Transmission speed
[bps: bits per second]
Parity check
Parity selection
Stop bit
Connector Printer side
128
This situation can be avoided by using the Epson ePOS SDK for iOS.
Serial
Asynchronous
Select one of the following with DIP switch 1-3:
 DTR/DSR
-3V to -15V logic "1"/OFF
+3V to +15V logic "0"/ON
Select one of the following with DIP switch 1-4:
 7 bit
 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
Select one of the following with DIP switch 1-5:
 Yes
Select one of the following with DIP switch 1-6:
 Even
1 or more bits
However, the stop bit for data transfer from the printer is fixed to 1 bit.
DSUB 25-pin (female) connector
Solution
Specifications
 XON/XOFF
 8 bit
 No
 Odd