The usb to rs485 four wire converter allows you to connect a non usb rs485 2 wire db9 device to your usb bus.
Rs485 4 wire to 2 wire converter.
Rs 485 is set up for four wire communication by default.
The usb hubs are ideal for connecting factory automation devices such as data loggers and industrial machinery.
In general it can be used with any protocol that adheres to the rs 485 standard operating at baud rates of 9600 19 2k or 38 4k bps.
On the rs 485 connector place jumper wires between txd and rxd and between txd and rxd.
For use with unicom 2500 converters and shark meters features this cable assembly was created to allow users to easily connect unicom 2500 rs485 to rs232 or fiber optic converters.
It is quite simple to make the connection between the two wiring just connect the positive lines together and do the same for negative lines.
Multidrop rs 485 networks require additional software development.
Check the data sheet schematic or block diagram.
Sciences offers the cnv 100 rs 485 2 wire to 4 wire converter.
For cabling solutions refer to ni serial cable product page.
Leds flash to confirm data transmit receive at both 2 wire and 4 wire sides.
Summary the rs 485 standard defines a multi point data communications interface using a balanced pair.
To connect a 2 wire device you will need to short the transmit and receive signals together on the rs 485 port.
6 foot length pre wired with connectors installed.
Figure 3 applies to most b b rs 485 converters or serial cards that can be set for 2 wire or 4 wire operation and for some 2 wire converters that use the same circuit board for the rs 422 model.
Two switches are set for 2w or to the 2 wire rs 485 mode.
Ni serial directly supports 4 wire full duplex operation on peer to peer rs 485 networks.
The cable easily wires and converts a 2 wire rs485 shark meter s input and the 4 wire unicom 2500 inputs.
To prevent reflections for both 2 and 4 wire transmission you must properly terminate the transmission lines.
This device is pre engineered to allow interoperability of 2 wire and 4 wire rs 485 devices in a variety of configurations.
The cnv 100 rs 485 eia 485 interfaces conform to the modbus standard for rs 485 serial data communications.
Refer to the pins below based on your connector type.
