CD5220 customer display
6
GND 5V or 12v
5 1
9 6
4. INTERFACE SPECIFICATIONS
4.1. Communication
4.1.1. Serial port (RS232C) communication
(a)
The interface specification are based on EIA RS232C baud
rate 9600 or 4800 bps ( selectable by DIP switch, refer Table
4-7) 8 data bits, no parity, 1 or more stop bits
(
B
) S
ERIAL PORT
(RS232C)
COMMUNICATION FLOW
1. Data flow :
PC/host to display, display to printer, printer to
PC/host
2. Control flow :
DISPLAY TO
PC/
HOST
,
PRINTER TO DISPLAY
,
PC/
HOST TO PRINTER
(c) CD5220/CD6220 will deactivate DTR or RTS signal to
PC/host with following two conditions.
1. Printer deactivates DTR or RTS signal.
2. The pass through buffer in CD5220/CD6220 is full (200
bytes).
* If PC/host keeps transmitting the data to printer when
CD5220/CD6220 deactivated DTR or RTS, data will be lost.
4.1.2 Serial port interface for circular base
A. Power connector
Connector type: DC jack (5.5 / 2.1)
B. RS232C interface to PC/HOST cable
PC/HOST side connector pin assignment
Connector type: D-sub 9 pin (Female)
No
Signal
direction
Function description
1
FG
-
Frame ground
2
TXD
From printer to PC/Host
Printer status data
3
RXD
From PC/Host to display
Receive data
4
DSR
From PC/Host to printer
PC/Host ready signal
5
GND
-
Signal ground
6
DTR
From display to PC/Host Display/printer ready signal
7
CTS
From PC/Host to printer
PC/Host ready signal
8
RTS
From display to PC/Host Display/printer ready signal
Table 4-3
