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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
Direc-
No. Name
tion
1
FG
–
Frame Ground
2
TD
Output
Transmitted Data. This pin carries information
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.
INTERFACE INFORMATION
Description
D-7
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