Rs485 Cable Diagram. Cable type shielded twisted pair in compliance with eia rs485 cable length 1200m maximum 4000 feet galvanic isolation no baud rate 110 57600 bps complete specification for the m90 19 r4 which converts serial data from the rs232 standard to either rs422 or rs485 is located on the setup cd. Tx and tx carry transmit data and rx and rx carry receive data.
Rs485 can handle speeds of over 10 mbits per second and line lengths of over 1 km. Transmitter receiver pairs may be present on the rs485 lines at one time. Connecting to a terminal block is recommended.
Rs485 half duplex wiring diagram two wire rs networks operate in half duplex mode on one twisted pair plus a the following diagram shows the daisy chain topology.
Proper wiring for rs 485. The card readers are normally in receive mode listening to the network for their address while. It supports distance of 10 meters for 30 35 mbps and 1200 meters for the data rate of about 100 kbps. For longer networks or placement of the usb rs485 cable in the middle of an rs485 network it is recommended that the attached wire is cut to 20cm or less to ensure signal integrity cables are fcc ce rohs compliant.