User`s manual

EC-80320 User’s Manual

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Note: “IN” means input to the printer，“OUT” means output from printer.

The signal logical level is TTL level.

Relative signal is shown as Fig 5-1.

5.2.2 Serial Interface (Optional)

EC80320 printer’s serial interface is compatible with RS-232C protocol, supporting RTS/CTS and

XON/XOFF handshaking protocol. The DB-25 connector and each pin’s definitions are shown as

below.

Table A-2 Pin assignments of the serial interface

Pin number Signal From Description

2 RXD Host Receive data from Host

3 TXD Printer Sent control code X-ON/X-OFF and data to the Host

5 CTS Printer “MARK” state means printer is too busy to receive data; “SPACE”

means printer is ready for receiving data.

7 GND — Signal GND

8 DTR Printer Same as CTS

Note: ”From” means from the source the signal sending out.

 Signal level is EIA level.

The default setting in serial stands for 9600bps, 8 bits, parity check disabled and 1 stop bit.

EC80320 printer can be connected to the standard RS-232C connector. When connecting with an

IBM PC or compatible PC, the connecting picture is shown as figure 5-3. While connecting with a

25 pin PC, you can connect the cable as shown in Fig 5-4.

BUSY

/ACK

DATA

/STB

0. 5μ S

0. 5

0. 5μ S

Fig 5-1 Timing signal in parallel

Fig 5-2: Sequence numbers of Serial connector