Serial port (RS232C)
Serial port (RS232C) communication
(a) This interface specification is based on EIA RS232C baud rate 300 to 38400
BPS, 8 data bits, none parity, 1 or more stop bits
(b) Serial port (RS232C) communication data link
Data link flow chart:
PC/HOST display
display printer
printer PC/HOST
Control for RTS and DTR :
PC/HOST display
display printer
printer PC/HOST
(c) The device will activate DTR or RTS signal to PC/host in the following two
conditions:
1. Printer will activate DTR or RTS signal.
2.The pass through buffer is full ( 200 bytes ) .
* If PC/host keeps transmitting the data to printer when CD3220 activate
DTR or RTS, the data will be lost.
Serial port interface to the space-saving base portion
(c) RS232C interface to PC/HOST cable, PC/HOST side
connector pin assignment
Connector type: D-sub 9 pin (Male)
Pin No.
Signal
Direction
Function description
2
TXD
From printer to PC/Host
Printer status data
3
RXD
Input
Receive data
4
DSR
From PC/HOST to printer
Host ready signal
5
GND
Signal ground
6
DTR
Output
Display/printer ready signal
7
RTS
Output
Display/printer ready signal
8
CTS
From PC/HOST to printer
Host ready signal
3
WPD-220 VF User’s Manual
Interface Specifications