Lake Shore Model 421 - Serial Interface Cable Wiring

Lake Shore Model 421 Gaussmeter User’s Manual
6-6 Service
6.5.1 Serial Interface Cable Wiring
The following are suggested cable wiring diagrams for connecting the Model 421 Serial Interface to
various Customer Personal Computers (PCs).
Model 421 to PC Serial Interface – PC with DE-9P
Model 421 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 421 to PC Serial Interface – PC with DE-25P
Model 421 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 421 to PC Interface using Null Modem Adapter
Model 421 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 421 on DTR.