137
Appendix
RS-232 Serial Interface (Serial model)
Interface board specifications (RS-232-compliant)
Functions of each connector pin
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
Pin no.
Signal name
Signal direction
Function
1
FG
—
Frame ground
2
TXD
Output
Transmission data
3
RXD
Input
Reception data
4
RTS
Output
Equivalent to DTR signal (pin 20)