User`s manual

WP-234 Printer User’s Manual24
RS-232 Serial
Version
Pin No. Signal DTE Direction Description
1 Chassis ground - Cable shield
2 (TD) Transmitted From printer Printer data output line
data
3 (RD) Received data To printer Printer data input line
7 (SG) Signal - Signal ground
10 +12VDC To printer Only w/9-12VDC option
11 (CTS) Clear to send From printer Signal (equivalent to
BUSY) indicating that
printer is ready for
operation and can
receive data.
21 Power return To printer Only w/9-12VDC option
Communication
Serial Interface Voltage Levels
Received data: Mark = OFF = Logic “1” = -25V to -3V
Space = ON = Logic “0” = +25V to +3V
Clear to send: Busy = OFF = Logic “1” = -9V
Not Busy = ON = Logic “0” = +9V
Transmitted data: Mark = OFF = Logic “1” = -9V
Space = ON = Logic “0” = +9V
The rest are not used.