RS-232/422/485 Pin-outs & Signal Wiring

RS-232 Signal Pin-outs of DB-9 Male

 

Pin 1 DCD
Pin 2 RxD
Pin 3 TxD
Pin 4 DTR
Pin 5 GND
Pin 6 DSR
Pin 7 RTS
Pin 8 CTS
Pin 9 RI

 

RS-232 Signal Pin-outs of 5-Pin Terminal Block

 

Pin 1 DCD
Pin 2 RxD
Pin 3 TxD
Pin 4 DTR
Pin 5 GND
Only USB-COM PRO and USB-2COM PRO offer 5-pin terminal block.

 

RS-422 Signal Pin-outs of DB-9 Male

 

Pin 1 TxD- (A)
Pin 2 TxD+(B)
Pin 3 RxD+(B)
Pin 4 RxD-(A)
Pin 5 GND
Pin 6 RTS- (A)
Pin 7 RTS+(B)
Pin 8 CTS+(B)
Pin 9 CTS- (A)

 

RS-422 Signal Pin-outs of 5-Pin Terminal Block

 

Pin 1 TxD- (A)
Pin 2 TxD+(B)
Pin 3 RxD+(B)
Pin 4 RxD-(A)
Pin 5 GND

Only USB-COM PRO and USB-2COM PRO offer 5-pin terminal block

 

RS-422 Signal Wiring

 

Point-to-Point 4 Wire Full Duplex
 
RS-422 with Handshaking
 

 

RS-485 4 Wire (Full duplex) Signal Pin-outs of DB-9 Male

Pin 1 TxD- (A)
Pin 2 TxD+(B)
Pin 3 RxD+(B)
Pin 4 RxD-(A)
Pin 5 GND

 

RS-485 4 Wire (Full duplex) Signal Pin-outs of 5-pin Terminal Block

 

Pin 1 TxD- (A)
Pin 2 TxD+(B)
Pin 3 RxD+(B)
Pin 4 RxD-(A)
Pin 5 GND
Only USB-COM PRO and USB-2COM PRO offer 5-pin terminal block.

 

RS-485 2 Wire (Half duplex) Signal Pin-outs of DB-9 Male

 

Pin 1 Data- (A)
Pin 2 Data+(B)
Pin 5 GND  

 

RS-485 2 Wire (Half duplex) Signal Pin-outs of 5-pin Terminal Block

 

Pin 1 Data- (A)
Pin 2 Data+(B)
Pin 5 GND  
Only USB-COM PRO and USB-2COM PRO offer 5-pin terminal block.

 

RS-485 Signal Wiring

 

Point-to-Point 4 Wire Full Duplex
 
Multidrop RS-485 2-Wire Half-duplex