Salter Brecknell 1200 Series - Manual (Page 22)

Model 122X MiniPrinter User’s Manual 22
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
Model 1220 (2600)
RS-232 Serial Version
Pin No. Signal DTE Direction Description
1 Chassis ground _ Cable shield
2 (RD) Received data To printer Printer data input line
5 (CTS) Clear to send From printer Signal (equivalent to
BUSY) indicating that
printer is ready for
operation and can
receive data.
7 (SG) Signal _ Signal Ground
The
rest
are not
used.