Interface, 1 pins and signal names, Pins and signal names – Citizen Systems CBM-820 Benutzerhandbuch
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6. Interface
This appendix provides detailed specifications for the printer’s standard serial
interface.
6.1
Pins and Signal Names
Pin
No.
Signal
Name
Direction
Function
1
FG
—
Frame ground
2
TXD
OUT
Transmission data
3
RXD
IN
Receive data
4
RTS
OUT
Same as DTR signal
5
N.C.
Not connected
6
DSR
IN
• DIP Switch 9 = OFF
In DTR/DSR communication mode when Memory Switch4-5 = 0, indicates whether data
receive from host is enabled or disabled.
Space: Receive enabled
Mark: Receive disabled
This signal is not checked in the X-ON/X-OFF communication mode.
• DIP Switch 9 = ON
This signal used for external reset. Printer is reset whenever signal is in mark state with
pulse width of 1mS or more.
7
SG
Signal ground
8 -19
N.C.
Not connected
13
25
1
14
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