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Serial Interface
C-8 User’s Manual
RS-232C is the standard serial interface for data terminal equipment
(DTE). The cable connector at the printer should be a D-subminiature
Cannon or Cinch DB-25P pronged connector or equivalent
conforming to EIA standards.
The following table shows pin assignments commonly used by most
processors.
Note the following:
•“Input” indicates a signal sent to the printer from the processor.
•“Output” indicates a signal sent from the printer.
• The signal level for mark (logical 1) is –3 V or lower; for space
(logical 0), it is +3 V or higher.
Table C–2 Serial interface
Pin
number
Signal Direction Description
1FG— Frame Ground
2 TD Output Transmitted Data. This pin carries
information from the printer to the
processor.
3 RD Input Received Data. This pin carries
information from the processor 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 processor is ready to receive data.
6 DSR Input Data Set Ready. Spaces are sent when
the processor is turned on and ready.
7SG— Signal Ground (common return)
8 CD Input Data Carrier Detect. Spaces are sent
when the processor lets the printer
receive data.
Serial Interface
DL6400/6600 Book Page 8 Thursday, September 21, 2000 7:52 PM