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Self-powered. Power adapter of 5V, 1.6 Amp included
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Virtual COM port drivers available for Windows 7, Vista, 2003, XP, 2000.
Power Supply
This 4-port RS-422/485 Adapter is provided with an external switching power adapter in the package.
Hardware Installation
Outside the unit, there are four 4-pin DIP switches which are set to select the mode of operation. You will need to set
the switch settings to RS-422 mode, or RS-485 mode, as per the requirements of your application. After setting of
switches and connecting power supply to the adapter, you then plug the adapter to USB port to start driver installation.
The RS-422 & RS-485 Mode Block Configuration Settings are listed as follows.
RS-422 and RS-485 Mode Block Configuration
SW1 (PORT1), SW2 (PORT2), SW3 (PORT3), SW4 (PORT4)
Operation Mode
S1
S2
S3
S4
RS-422
4 wire with handshaking
ON↑
ON↑
OFF↓
OFF↓
RS-485
Full Duplex (4 wire)
ON↑
OFF↓
OFF↓
OFF↓
Half Duplex (2 wire) with Echo
OFF↓
OFF↓
OFF↓
ON↑
Note
Half Duplex (2 wire) without Echo
OFF↓
OFF↓
ON↑
ON↑
Note
Note:
In the most common situations, a 120 Ohm termination resistor of TxD (S4 is ON ) is required in a RS485
Half Duplex configuration. Otherwise it is rarely used.
Inside the unit, there are four 6x2 (8pin) header blocks which are jumped to enable Rx, CTS 120 Ohm termination
resistors and RX, Tx 750 Ohm biasing resistor. You will need to open up the 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.
JP5 (PORT1), JP6 (PORT2), JP7 (PORT3), JP8 (PORT4) for Termination and
Biasing Option Configuration
Jumper Function
1-2
Pull-up Tx+ to VCC by 750 Ohm Bias resistor.
This jumper should be populated for pull-up Tx+.
3-4
Pull-down Tx- to GND by 750 Ohm Bias resistor.
This jumper should be populated for pull-down Tx-.
5-6
Rx+/- Termination of 120 Ohm.
This jumper should always be populated forRS-422 and RS485 Full-Duplex mode.
7-8
Pull-up Rx+ to VCC by 750 Ohm Bias resistor.
This jumper should be populated for pull-up Rx+.
9-10
Pull-down Rx- to GND by 750 Ohm Bias resistor.
This jumper should be populated for pull-down Rx-.
11-12
CTS Termination of 120 Ohm.
