Using The Addressable Bus Converter; Usb Mode; Ttl Mode - Geokon 8020-38 Instruction Manual

3.

USING THE ADDRESSABLE BUS CONVERTER

The 8020-38 Addressable Bus Converter automatically detects the connection
type. The USB connection always takes precedence over the TTL connection, so
the USB port must be vacant when the converter is intended for a TTL
connection.

3.1 USB MODE

The Addressable Bus Converter will display as a virtual COM port in the Device
Manager when it is plugged into a computer's USB port.
Windows 10 immediately recognizes CDC (Communication Device Class) USB
devices, so no driver installation is necessary for PCs with this operating system.
However, Windows versions 7, 8, and 8.1 require custom drivers to
communicate with the Addressable Bus Converter. See Appendix B for
instructions on how to install the required USB drivers for the Converter.
Once the Addressable Bus Converter is connected to the RS-485 bus and the PC
via the USB cable, it is powered up and ready to operate.
Note: When the USB cable is plugged in, the Converter automatically
electronically disconnects the external power supply provided on the TTL spring
terminal (if connected). The Converter and the addressable sensor string are
powered from the USB supply.

3.2 TTL MODE

TTL mode is engaged as long as a USB cable is not connected to the
Addressable Bus Converter and the device is supplied power from the 12V
connection on the TTL spring terminal. At this point the Converter is powered up
and ready to operate, assuming the bit rate of the Addressable Sensor String is
115,200 bits per second, or was updated to the proper value over a USB
connection.
6 | USING THE ADDRESSABLE BUS CONVERTER | GEOKON