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Lid Screws (x4)
Lid
PCB Screws (x4)
PCB
Enclosure
USB Screws (x2)
FIGURE 5: Disassembling the 8020-38
Converter
2.2.2 USING TERMINAL EMULATION
There might be times when no dedicated USB host software is available. An
example of this is when the system will be used in a TTL to RS-485 application.
For such times a terminal emulator program such as Docklight™ or
Hyperterminal™ can be substituted for the USB host software. Do the following:
1.
Connect the Converter to a PC using a USB cable.
2.
Open the terminal emulator program.
3.
Select the COM port and bit rate settings.
4.
Open the connection.
2.3 CONFIGURING TTL INVERSION
Some dataloggers communicate over the TTL connection using inverted logic.
When connecting a
GEOKON
TTL signals, be sure to configure the Converter to handle this form of
communication. Do the following:
1.
Remove the two USB connector screws.
2.
Remove the four enclosure lid screws and remove the lid.
3.
Remove the four PCB mounting screws.
Warning: Use ESD protection for the remaining steps to avoid causing
damage to the PCB.
4.
Remove the PCB from the enclosure.
5.
Flip the PCB upside down and move the 'INV TTL' switch to the ON position.
FIGURE 6: TTL Inversion ON/OFF switch
6.
Re-assemble the Converter by following the previous steps in reverse.
For your convenience this setting can be applied by
out the Converter.
MODEL 8020-38 ADDRESSABLE BUS CONVERTER | INSTALLATION | 5
addressable sensor string to a logger with inverted
GEOKON
prior to shipping
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