Hardware Setting & Mode Configuration

Inside the unit, there are four 4-pin DIP switch which is set to select the mode of operation. You can set the switch settings to RS-232 mode, RS-422 mode, or RS-485 mode, as per the requirements of your application. After setting of switches, you then proceed to insert the driver CD and start driver installation.

 

The RS-232 & RS-422 & RS-485 Mode Block Configuration Settings are listed as follows.

RS-232 & RS-422 & RS-485 Mode Block Configuration

 

SW1~SW4 (DIP Switch) for Mode Setting

 

 

Operation  Mode S1 S2 S3 S4
RS-232 Standard RS-232 Mode
OFF
ON ON ON
RS-422 4 wire with Handshaking ON ON ON ON
RS-485 Full Duplex (4 wire) ON
OFF
ON ON
Half Duplex (2 wire) - with Echo ON
OFF

OFF
ON
Half Duplex (2 wire)  - without Echo ON
OFF

OFF

OFF

 

Inside the unit, there are four 3 x 7 (JP1~JP4) header blocks which are jumpered Tx, Rx, CTS 120 Ohm termination resistors and Tx, Rx 750 Ohm BIASing resistor.  

You will need to open up the metal case and set the jumper setting for RS-422 mode or RS-485 mode as per the requirements of your application.

 

JP1~JP4 settings are listed as follows:

Jumper Function
1-2         enable
2-3        disable
Tx Termination of 120 Ohm. This jumper should always be populated for RS-485 mode.
4-5         enable
5-6        disable
Pull-up Tx+ to VCC by 750 Ohm Bias resistor. This jumper should be populated for pull-up Tx+.
7-8         enable
8-9        disable
Pull-down Tx- to GND by 750 Ohm Bias resistor. This jumper should be populated for pull-down Tx- .
10-11     enable
11-12     disable
Rx Termination of 120 Ohm. This jumper should always be populated for RS-422 mode.
13-14     enable
14-15     disable
Pull-up Rx+ to VCC by 750 Ohm Bias resistor. This jumper should be populated for pull-up Rx+.
16-17     enable
17-18     disable
Pull-down Rx- to GND by 750 Ohm Bias resistor. This jumper should be populated for pull-down Rx-.
19-20     enable
20-21     disable
CTS Termination of 120 Ohm. This jumper should always be populated for RS-422 mode.

 

DB-37 Female Connector Pin-outs

RS-232 Signal Pin-outs of DB-37 Female

 

Pin 1 .nc. Pin 20 .nc.
Pin 2 DCD(3) Pin 21 DTR(3)
Pin 3 GND Pin 22 DSR(3)
Pin 4 CTS(3) Pin 23 RTS(3)
Pin 5 RxD(3) Pin 24 TxD(3)
Pin 6 .nc. Pin 25 DCD(4)
Pin 7 DTR(4) Pin 26 GND
Pin 8 DSR(4) Pin 27 CTS(4)
Pin 9 RTS(4) Pin 28 RxD(4)
Pin 10 TxD(4) Pin 29 .nc.
Pin 11 DCD(2) Pin 30 DTR(2)
Pin 12 GND Pin 31 DSR(2)
Pin 13 CTS(2) Pin 32 RTS(2)
Pin 14 RxD(2) Pin 33 TxD(2)
Pin 15 .nc. Pin 34 DCD(1)
Pin 16 DTR(1) Pin 35 GND
Pin 17 DSR(1) Pin 36 CTS(1)
Pin 18 RTS(1) Pin 37 RxD(1)
Pin 19 TxD(1)    

 

RS-422 Signal Pin-outs of DB-37 Female

 

Pin 1   Pin 20 CTS- (3)
Pin 2 TxD- (3) Pin 21 RxD- (3)
Pin 3 GND Pin 22 RTS- (3)
Pin 4 CTS+(3) Pin 23 RTS+(3)
Pin 5 TxD+(3) Pin 24 RxD+(3)
Pin 6 CTS- (4) Pin 25 TxD- (4)
Pin 7 RxD- (4) Pin 26 GND
Pin 8 RTS- (4) Pin 27 CTS+(4)
Pin 9 RTS+(4) Pin 28 TxD+(4)
Pin 10 RxD+(4) Pin 29 CTS- (2)
Pin 11 TxD- (2) Pin 30 RxD- (2)
Pin 12 GND Pin 31 RTS- (2)
Pin 13 CTS+(2) Pin 32 RTS+(2)
Pin 14 TxD+(2) Pin 33 RxD+ (2)
Pin 15 CTS- (1) Pin 34 TxD- (1)
Pin 16 RxD- (1) Pin 35 GND
Pin 17 RTS- (1) Pin 36 CTS+(1)
Pin 18 RTS+(1) Pin 37 TxD+(1)
Pin 19 RxD+(1)    

 

RS-485 4-Wire (Full duplex) Signal Pin-outs of DB-37 Female

 

Pin 1   Pin 20  
Pin 2 TxD- (3) Pin 21 RxD- (3)
Pin 3 GND Pin 22  
Pin 4   Pin 23  
Pin 5 TxD+(3) Pin 24 RxD+(3)
Pin 6   Pin 25 TxD- (4)
Pin 7 RxD- (4) Pin 26 GND
Pin 8   Pin 27  
Pin 9   Pin 28 TxD+(4)
Pin 10 RxD+(4) Pin 29  
Pin 11 TxD- (2) Pin 30 RxD- (2)
Pin 12 GND Pin 31  
Pin 13   Pin 32  
Pin 14 TxD+(2) Pin 33 RxD+ (2)
Pin 15   Pin 34 TxD- (1)
Pin 16 RxD- (1) Pin 35 GND
Pin 17   Pin 36  
Pin 18   Pin 37 TxD+(1)
Pin 19 RxD+(1)    

 

RS-485 2-Wire (Half duplex) Signal Pin-outs of DB-37 Female

 

Pin 1   Pin 20  
Pin 2 Data- (3) Pin 21  
Pin 3 GND Pin 22  
Pin 4   Pin 23  
Pin 5 Data+(3) Pin 24  
Pin 6   Pin 25 Data- (4)
Pin 7   Pin 26 GND
Pin 8   Pin 27  
Pin 9   Pin 28 Data+(4)
Pin 10   Pin 29  
Pin 11 Data- (2) Pin 30  
Pin 12 GND Pin 31  
Pin 13   Pin 32  
Pin 14 Data+(2) Pin 33  
Pin 15   Pin 34 Data- (1)
Pin 16   Pin 35 GND
Pin 17   Pin 36  
Pin 18   Pin 37 Data+(1)
Pin 19      

 

RS-232 DB9 Male Connector Pin-outs

 

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 .nc.

 

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 Wiring

 

Point-to-Point 4 Wire Full Duplex

 

USB2-4COMi-M CBL                    RS-422 Device

 

RS-422 with Handshaking

 

  USB2-4COMi-M CBL           RS-422 Device

 

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

 

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

 

RS-485 Signal Wiring

 

Point-to-Point 4 Wire Full Duplex

 

  USB2-4COMi-M CBL           RS-485 Device

 

Multidrop RS-485 2-Wire Half-duplex

 

  USB2-4COMi-M CBL                  RS-485 Device