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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
Serial Cable Information
The information in this section will help you make a serial cable to connect between the printer
and computer.
Refer to the computer documentation to determine the cable requirements on the computers end.
The printer has the following cable requirements.
Shielded, RS-232C cable
UL and CSA approved
No more than 50 feet long
Cannon DB-25P plug (or equivalent) with 25 pins
Cannon DB-C2-J9 (or equivalent) connector shell
Serial Interface Signal Requirements
1
Protective
Ground
PG
Ground
Connected to the printer
frame
2
Transmit Data
TD
From Printer
Serial data transmitted to the
system
3
Receive Data
RD
To Printer
Serial data received by the
printer
4
Request to Send
RTS
From Printer
Always set to low (mark)
5
Not Used
6
Data Set Ready
DSR
To Printer
Indicates that data can be
sent
7
Signal Ground
SG
Ground
Ground
8 to 10
Not Used
11
Supervisory
Send Data
SSD
From Printer
Indicates that the printer is not
ready to receive data
12 to 19
Not Used
