User's Manual

Chapter 1 - Product Overview Landis+Gyr
12 98-1546 Rev AA UtiliNet SCADA Single Board Radio
The entire USB protocol is handled by the USB Serial Interface cable when connected to the pc, thus
no USB specific firmware programming is required.
Because most computer USB ports can only source 100 mA of current, the USB cable sets the device
for RF Low Power Mode by grounding pin 8 of the I/O connector. This mode sets the output power
level to approximately 25 mW. The USB is 2.0 Full Speed compatible thus providing for COM Port
data rates between 300 to 38,200 BPS as required by the radio LPP port.
USB Cable Installation
Connect the device to a spare USB port on your PC. The Microsoft composite device driver is
automatically loaded silently in the background. Once the composite driver has been installed
Windows Found New Hardware Wizard will launch.
The installation process may continue by installing the USB Serial Converter driver for a second
port of the USB Cable. The procedure for installing the second port is identical to that for installing
the first port from the first screen of the Found New Hardware Wizard.
Table 1-3. USB Cable I/O Operating Parameters
Parameter Description Min Type Max Unit Conditions
VCC
Output Power
Voltage
4.25 5.0 5.25 VDC
Dependant on the USB port that
the TTL-232R-3V3 is connected to
I/O
Output Power
Current
N/A N/A
100 mA
N/A
T
Operating
Temperature Range
-40 - +85 °C
N/A
Prior to connecting the USB cable the first time, make sure the PC is connected to the Internet.