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20
DTR
Fig. 2-3 The pin assignment of serial interface
Note: (1)"Source" denotes the source that signal come from;
(2)Logical signal level is EIA.
The baud rate and data structure in serial interface mode is 9600bps, 8-bit
data bits, no parity bit and 1 stop bit.
The serial interface of PR-250 can be connected to standard RS-232C
interface. When it is connected to IBM PC or its compatible machine,
connection can accord to Fig.2-4.
3
RXD
20
DTR
4
RTS
2
TXD
6
7
DSR
GND
Printer
25PIN Socket
Fig.2-4 Connection between PR-250 and IBM PC Serial Interface Sketch Map
The pin assignment of DB9 interface is as below shows:
Pin No.
Signal Name
2
TXD
3
RXD
Output
Printer
3
TXD
6
DSR
8
CTS
2
4
RXD
5
DTR
GND
IBM PC
DB9 Socket
Source
Printer
Host
7
Signal "MARK" means the
host is busy and can not
receive
"SPACE" means the host is
ready to receive data.
3
RXD
20
DTR
4
RTS
2
TXD
6
20
7
DSR
GND
Printer
25PIN Socket
Description
Printer transmits control code
X-ON/X-OFF and data to host
Printer receives data from host
data.
Signal
2
TXD
6
DSR
5
CTS
3
RXD
7
DTR
GND
IBM PC
DB25 Socket
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