Serial Interface - Fujitsu DL7400Pro User Manual

SERIAL INTERFACE

User's Manual
RS-232C is the standard serial interface for data terminal equipment. The
cable connector at the printer side should be a D-subminiature Cannon or
Cinch DB-25P male connector or equivalent that conforms to EIA
standards.
The table that follows shows the pin assignments commonly used by
most computers. In the table:

"Input" denotes a signal from the computer to the printer.

"Output" denotes a signal from the printer to the computer.

The signal level for mark state (logical 1) is -3 V or lower; for
space state (logical 0), it is +3 V or higher.
Pin Signal
Direction
No. Name

1 FG
2 TD Output
3 RD Input
4 RTS Output
5 CTS Input
6 DSR Input
7 SG 
8 CD Input
11 RC Output
20 DTR Output
INTERFACE INFORMATION
Description
Frame Ground
This pin carries information from the printer
to the computer.
Received Data. This pin carries information
from the computer to the printer.
Request To Send. Spaces are sent when the
printer is ready to transmit data.
Clear To Send. Spaces are sent when the
computer is ready to receive data.
Data Set Ready. Spaces are sent when the
computer has been powered on and is ready
to receive or transmit data.
Signal Ground (common return)
Carrier Detect. Spaces are sent when the
computer allows the printer to receive data.
Reverse Channel. This signal is used instead
of the DTR signal in the RC protocol.
Spaces are sent when the printer is ready to
receive or transmit data.
Data Terminal Ready. Spaces are sent when
the printer has been powered on and is ready
to receive or transmit data.
D-7