CD5220 customer display

4. INTERFACE SPECIFICATIONS

4.1Communication

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

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Epson CD5220 manual Interface Specifications, Communication Serial port RS232C communication