2.1.3 SW3 Line termination switch
In some instances. the Modbus serial bus will need to be terminated. SW3 inserts a 120
Ohm resistor across D• and 0-. In the interests of saving power. it is recommended to
only use the termination if the sensor requires it. In most cases it should not be required.
2.1.4 J1 External sensor supply interface
The DataSlave can power the vast majority of industrial sensors from the internal AA
batteries through its specially designed switched mode boost power supply. There may
be an application that is a little more demanding. for example the sensor requires more
than 75mA. J1 allows an external 12VDC sensor supply to be added. This supply is fed
through to the Modbus/SDl-12 connector. Please note that this external supply does not
power the rest of the internal hardware, so the internal AA batteries will still be required.
2.1.5 Factory headers
The JS socket and HDR1 header are reserved for factory setup and future expansion use
only.
2.1.6 LED1
LED1 performs a useful visual indication for diagnostic purposes.
2.1.61 Poweron
When the DataSlave is powered on. for example inserting the internal batteries, the LED
will blink three times.
2.1.62 Factory reset
During a factory reset procedure as described in 2.1.1 .2 , the LED will strobe at increasing
frequency for 10 seconds to give warning.
21.63 Acknowledgement
A simple single blink will occur if SW1 has been pressed and the DataSlave received an
acknowledgement from a remote receiver such as a Van Walt Data Hub, a Mandar
Gateway or a USB Configuration Tool.
21.64 Fault
A continuous fast flash indicates that a fault has occurred The unit will indicate a fault for
up to 30 seconds before it will reboot to try to correct any issues.
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