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Omega Model CYC325 Temperature Controller User’s Manual
8.7.1 Serial Interface Cable Wiring
The following are suggested cable wiring diagrams for connecting the Model CYC325 serial interface to various
customer personal computers (PCs).
Model CYC325 to PC Serial Interface – PC with DE-9P
Model CYC325 DE-9P
Standard Null-Modem Cable (DE-9S to DE-9S)
5 - GND
2 - RD (in)
3 - TD (out)
4 - DTR (out)
6 - DSR (in)
1 - NC
7 - DTR (tied to 4)
8 - NC
PC DE-9P
5 - GND
3 - TD (out)
2 - RD (in)
6 - DSR (in)
4 - DTR (out)
7 - RTS (out)
8 - CTS (in)
1 - DCD (in)
Model CYC325 to PC Serial Interface – PC with DB-25P
Model CYC325 DE-9P Standard Null-Modem Cable (DE-9S to DB-25S)
PC DB-25P
5 - GND
2 - RD (in)
3 - TD (out)
1 - NC
7 - DTR (tied to 4)
8 - NC
6 - DSR (in)
4 - DTR (out)
7 - GND
2 - TD (out)
3 - RD (in)
4 - RTS (out)
5 - CTS (in)
8 - DCD (in)
20 - DTR (out)
6 - DSR (in)
Model CYC325 to PC Interface using Null Modem Adapter
Model CYC325 DE-9P
5 - GND
2 - RD (in)
3 - TD (out)
1 - NC
6 - DSR (in)
4 - DTR (out)
7 - DTR (tied to 4)
8 - NC
9 - NC
NOTE:
8-6
Null Modem Adapter
PC DE-9P
5 - GND
3 - TD (out)
2 - RD (in)
4 - DTR (out)
1 - DCD (in)
6 - DSR (in)
8 - CTS (in)
7 - RTS (out)
9 - NC
Same as null modem cable design except PC CTS is provided from the Model CYC325 on DTR.
Service