CD7220/CD3220 CUSTOMER DISPLAY
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4. INTERFACE SPECIFICATIONS
4.1 Serial port (RS232C)
4.1.1 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) CD7220 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 in CD7220/CD3220 is full ( 200 bytes ) .
* If PC/host keep transmitting the data to printer when CD7220/CD3220 activate DTR or RTS, the data will be lost.
4.1.2 Serial port interface for
rectangle
basic section
(a) Serial port interface connector position for rectangle basic section
GND 5V or 12V
24V
OUTPUT
Power input
DC JACK
RS232C to
Printer (pass through)
Display panel connector (phone jack)
RS232C to
PC/Host
24V
INPUT
(b) Power input
Connector type: DC JACK (5.5/2.1)
Hoshiden connector for 24VDC
