FUJITSU DL3800 User Manual
Page 219
Interface
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User's Manual
INTERFACE INFORMATION
SERIAL INTERFACE
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
Direc-
Description
No. Name
tion
1
FG
–
Frame Ground
2
TD
Output Transmitted Data. This pin carries informa-
tion from the printer to the computer.
3
RD
Input
Received Data. This pin carries information
from the computer to the printer.
4
RTS
Output Request To Send. Spaces are sent when the
printer is ready to transmit data.
5
CTS
Input
Clear To Send. Spaces are sent when the
computer is ready to receive data.
6
DSR
Input
Data Set Ready. Spaces are sent when the
computer has been powered on and is ready
to receive or transmit data.
7
SG
–
Signal Ground (common return)
8
CD
Input
Carrier Detect. Spaces are sent when the
computer allows the printer to receive data.
11
RC
Output 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.
20
DTR
Output Data Terminal Ready. Spaces are sent when
the printer has been powered on and is ready
to receive or transmit data.
#D Appendix D
2000.09.20, 2:47 PM
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