Lake Shore Model 331 Temperature Controller User’s Manual
8.4.1
Serial Interface Cable Wiring
The following are suggested cable wiring diagrams for connecting the Model 331 Serial Interface to
various Customer Personal Computers (PCs).
Model 331 to PC Serial Interface – PC with DE-9P
Model 331 DE-9P
Standard Null-Modem Cable (DE-9S to DE-9S)
PC DE-9P
5 - GND
5 - GND
2 - RD (in)
3 - TD (out)
3 - TD (out)
2 - RD (in)
4 - DTR (out)
6 - DSR (in)
6 - DSR (in)
4 - DTR (out)
1 - NC
7 - RTS (out)
7 - DTR (tied to 4)
8 - CTS (in)
8 - NC
1 - DCD (in)
Model 331 to PC Serial Interface – PC with DB-25P
Model 331 DE-9P
Standard Null-Modem Cable (DE-9S to DB-25S)
PC DB-25P
5 - GND
7 - GND
2 - RD (in)
2 - TD (out)
3 - TD (out)
3 - RD (in)
1 - NC
4 - RTS (out)
7 - DTR (tied to 4)
5 - CTS (in)
8 - NC
8 - DCD (in)
6 - DSR (in)
20 - DTR (out)
4 - DTR (out)
6 - DSR (in)
Model 331 to PC Interface using Null Modem Adapter
Model 331 DE-9P
Null Modem Adapter
PC DE-9P
5 - GND
5 - GND
2 - RD (in)
3 - TD (out)
3 - TD (out)
2 - RD (in)
1 - NC
4 - DTR (out)
6 - DSR (in)
1 - DCD (in)
4 - DTR (out)
6 - DSR (in)
7 - DTR (tied to 4)
8 - CTS (in)
8 - NC
7 - RTS (out)
9 - NC
9 - NC
NOTE:
Same as null modem cable design except PC CTS is provided from the
Model 331 on DTR.
Service
8-5
