Epson C31CE94061N - RS-232 Serial Interface

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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
 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