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Service Guide ML380
Chapter 4 Failure & Repair Analysis
Serial Interface Signal Requirements
Pin
Signal
Symbol
Direction
Description
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
20
Data Terminal
Ready
DTR
From
Printer
Indicates that the printer is not ready
to receive data
21 to
25
Not Used
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Summary of Contents for ML380
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