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WindowsRS232 Pin Connection Reference

Figure 1. DB9F to DB25M, NULL Modem (Crossover)

diagram

For Reference Only

 

Figure 2. DB25F to DB25M, NULL Modem (Crossover)

diagram

For Reference Only

 

Figure 3. DB9F to DB25M, Straight

diagram

For Reference Only

 

Figure 4. RS232C PC 9-Pin Male

Pin (DB9) Signal Function Label I/O Type
1 Carrier Detect CD Input
2 Receive Data RD Input
3 Transmit Data TD Output
4 Data Terminal Ready DTR Output
5 Signal Ground SG ---
6 Data Set Ready DSR Input
7 Request to Send RTS Output
8 Clear to Send CTS Input

For Reference Only

 

Figure 5. RS232C PC 25-Pin Male

Pin (DB25) Signal Function Label I/O Type
1 Protective Ground PG ---
2 Transmit Data TD Output
3 Receive Data RD Input
4 Request to Send RTS Output
5 Clear to Send CTS Input
6 Data Set Ready DSR Input
7 Signal Ground SG ---
8 Carrier Detect CD Input
20 Data Terminal Ready DTR Output

For Reference Only

 

Figure 6. RS232C CNC 25-Pin Female

Pin (DB25) Signal Function Label I/O Type
1 Protective Ground PG ---
2 Transmit Data TD Output
3 Receive Data RD Input
4 Request to Send RTS Output
5 Clear to Send CTS Input
6 Data Set Ready DSR Input
7 Signal Ground SG ---
8 Carrier Detect CD Input
20 Data Terminal Ready DTR Output

For Reference Only

 

Figure 7. DB25M/RJ45 Modular Adapter
EIA/TIA 561diagram

DB25 Wire Color RJ45
1 No Connection ---
2 Green 5
3 Yellow 6
4 White 8
5 Brown 7
6 Blue 1
7 Red 4
8 Orange 2
20 Black 3

For Reference Only

 

Figure 8. DB9F/RJ45 Modular Adapter
EIA/TIA 561diagram

DB9 Wire Color RJ45
1 Orange 2
2 Yellow 6
3 Green 5
4 Black 3
5 Red 4
6 Blue 1
7 White 8
8 Brown 7
9 --- ---

For Reference Only

 

 

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