Schematic

RS-485 WIRELESS BRIDGE USER’S MANAUL REV. 02 6
Operation
Standard Operation
The RS-485 Wireless Bridge is designed to be data transparent. By default, any data sent into one device
is broadcast and received by all other Wireless Bridge devices within range. Any device that receives the
transmitted data packet will send the received data out the serial port to its host. Without any
configuration the Wireless Bridge will operate in a point-to-point or point-to-multipoint mode making it
easy to replace an RS-485 multi-drop cable. Additional addressing can be used to isolate communication
between specific devices or to create unique networks.
The Wireless Bridge device is equipped with a micro USB connector. When the micro USB connector is
plugged into a USB host device such as a computer, the Wireless Bridge enumerates as two standard
serial COM ports. One port is a data port and can send and receive data. The second COM port is the
device’s information port.
The Wireless Bridge uses standard composite device drivers which are preinstalled in Windows 10 and
MAC computers. Drivers will need to be installed for Windows 7 machines. While not every machine will
enumerate exactly the same, as a general rule the lower numbered COM port is for Wireless Bridge
configuration. The higher numbered COM port can be used to transmit or receive data over the USB
port.
LED Indication
The wireless bridge has four LEDS for indication. The Blue Power LED is lit any time the Wireless Bridge is
properly powered. A green TX LED and yellow RX LEDs indicate activity on the serial port of the device.
They do not necessarily reflect all activity that may be occurring over the air as they will only blink when
a properly addressed data packet is received. The Special function LED is lit when the USB port is in use.
Data Formats and Baud Rates
The default baud rate and data format is 9600 baud, 8 data bits, no parity and one stop bit. The baud
rate and data format can be adjusted by adjusting the BD and NB parameter of the radio module (See
the Changing the Baud Rate section). Baud rates can be set from 1200 to 115200 bps. If the data of the
sending or receiving devices do not correspond with the data settings of the Wireless Bridge then the
output data will appear garbled.