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2.3 Interface
2.3.1 Serial Interface
The serial interface of PR-250 printer is compatible with RS-232C, supports
DTR/DSR and XON/XOFF handshaking protocols, uses DB25 socket (female).
The pin order of the serial port is as Fig.2-2 shows:
The pin assignment of serial interface is shown in Fig. 2-3:
Pin
Signal
No.
Name
1
FG
2
TXD
3
RXD
4
RTS
6
DSR
7
GND
Fig.2-2 Pin Order of Serial Port
Signal
Direction
——
——
Output
Printer
Input
Host
Output
Printer
Input
Host
——
——
Source
Description
Cover ground
Printer transmits control code
X-ON/X-OFF and data to
host
Printer receives data from
host
The same with 20pins DTR
signal
Signal "MARK" means the
host is busy and can not
receive
"SPACE" means the host is
ready to receive data.
Signal Ground
6
data.
Signal
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