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CD5220 customer display
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 ( select by DIP switch, refer Table 4-7) 8 data bits, none parity, 1
or more stop bits
(b) Serial 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 inactive DTR or RTS signal to PC/host, the
following two condition.
1. Printer inactive DTR or RTS signal.
2. The pass through buffer in CD5220/CD6220 is full ( 200bytes ) .
* If PC/host keep transmitting the data to printer when CD5220/CD6220
inactive DTR or RTS , data will be lost.
4.1.2 Parallel port (Centronic) communication
(a) data flow : PC/Host to display, display to printer
(b) control flow : printer to display , display to PC/Host
(c) When data has been transmitted to printer by parallel port interface, the
CD5220/CD6220 response the printer status to PC/Host, When printer
active the BUSY signal, CD5220/CD6220 will keep accept the data until the