Rs-232 Serial Interface - Epson TM-T88VII Technical Reference Manual

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
Functions of each connector pin
Pin no. Signal name
1 FG
2 TXD
3 RXD
4 RTS
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
Signal direction
— Frame ground
Output Transmission data
Input Reception data
Output Equivalent to DTR signal (pin 20)
Specifications
• XON/XOFF
• 8 bit
• No
• Odd
Function
Appendix
123