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Hardware Installation
Outside the unit, there are eight 3-pin DIP switches which are set to select the mode of operation. You will need to set
the switch settings to RS-422 or RS-485 mode as per the requirements of your application.
You need to install driver first, prior to hardware installation. After the setting of DIP switches and connecting power
cord to the adapter, you then plug the adapter to USB port to start driver installation.
The Mode Block Configuration Settings are listed as follows:
SW1 (Port-1), SW2 (Port-2), SW3 (Port-3), SW4 (Port-4)
SW5 (Port-5), SW6 (Port-6), SW7 (Port-7), SW8 (Port-8)
Operation Mode
S1
S2
S3
RS-422
4 wire with Handshaking
ON
ON
ON
RS-485
Full Duplex (4 wire)
OFF
ON
ON
Half Duplex (2 wire)
-
With Echo
OFF
OFF
ON
Half Duplex (2 wire)
-
Without Echo
OFF
OFF
OFF
JP3 (Port-1), JP4 (Port-2), JP5 (Port-3), JP6 (Port-4)
JP7 (Port-5), JP8 (Port-6), JP9 (Port-7), JP10 (Port-8)
for Termination and Biasing Option Configuration
Inside the unit, there are eight 2 x 7 (14 pin) header blocks which are jumpered to enable 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.
Settings are listed as follows:
Jumper
Function
1-2
Tx Termination of 120 Ohm.
This jumper should always be populated for RS-485 mode.
3-4
Pull-up Tx+ to VCC by 750 Ohm Bias resistor.
This jumper should be populated for pull-up Tx+.
5-6
Pull-down Tx- to GND by 750 Ohm Bias resistor.
This jumper should be populated for pull-down Tx- .
7-8
Rx Termination of 120 Ohm.
This jumper should always be populated for RS-422 mode.
9-10
Pull-up Rx+ to VCC by 750 Ohm Bias resistor.
