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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
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1. Connectors
On the printer: 25-hole receptacle, equivalent to
DB-25S (Canon)
On the cable: 25-pin plug, equivalent to DB-25P
(Canon) Shell equivalent to DB-C2-J9 (Canon)
2. Cable
Use cable less than 25 feet long. A shielded
cable using twisted pair conductors is desir-
able.