USB-8COMi-RM – Product Manual
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2.
Hardware Installation
Outside the unit, there are eight 4-pin DIP switches which are set to select the mode of
operation. You will need to set the switch settings to RS-232 mode, or RS-422 or RS-485
mode as per the requirements of your application.
Note:
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
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
JP1 (Port-1), JP2 (Port-2), JP3 (Port-3), JP4 (Port-4), JP5 (Port-5), JP6 (Port-6), JP7 (Port-
7), JP8 (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.
