2
| INSTALLATION | GEOKON
2.
INSTALLATION
2.1
THERMISTOR STRING
Uncoil the thermistor string and place it in the installation medium. For
installations in which the string will be in contact with soil, rock, etc., take care
to prevent damage to the cable and sensor. The termination assembly at the end
of the string is made with a 1/4-20 x 1/2” deep threaded hole in it. This allows for
a weight or cord/rope to be attached for assisting with the installation. The
maximum pulling force that can safely be applied to the string is 20 lb.
FIGURE 3:
Model 3810A-3 End Terminator
Table 1 shows the function of each of the conductors of the instrument cable.
TABLE 1:
3810A Wiring
2.2
HARDWARE REQUIREMENTS
Communications:
RS-485, half-duplex
Baud Rate:
115200
Power:
12.0V ± 20% @ 1.2mA/sensor
2.3
TTL / USB TO RS-485 CONVERTER
GEOKON
manufactures the Model 8020-38 Addressable Bus Converter for
connecting addressable strings to personal computers, readouts, dataloggers,
and programmable logic controllers. The converter acts as a bridge between
USB/TTL-capable readers and the
GEOKON
RS-485-enabled sensor strings.
FIGURE 4:
Model 8020-38 Addressable Bus Converter
For more information, please refer to the Model 8020-38 Addressable Bus
Converter Instruction Manual.
3810A String
Description
Red
String Power
White
Communication RS-485+
Green
Communication RS-485-
Black
Ground
Shield
Analog Ground
