• P1 for Channel 1 & 2
• P2 for Channel 3 & 4
• P3 for Channel 5 & 6
• P4 for Channel 7 & 8

The eight analog channels have identical characteristics. Each channel can operate in two modes, Absolute and Ratiometric. The mode of operation is determined by the probe type selected for that channel. The probe type is selected using the Channel and Probe Setup Tab of the Logger Control Screen in the Omnilog Software. Using this software, a different Probe can be selected for each Channel. Temperature (Thermister) , Pressure and Humidity probes are typically Ratiometric. Voltage and current inputs are Absolute.

The fast pulse input can be used in two modes, Counter or Frequency.
Counter mode is used for  functions such as rainfall.  Frequency Mode is used  for wind speed or flow sensors. The mode of operation is determined by the probe type selected for that channel. The probe type is selected using the Channel and Probe Setup Tab of the Logger Control Screen in the Omnilog Software.

GP-MC RS485 Overview  

1... Remote Probe Controller (RPC)

This device has three analog inputs and one fast pulse input. It is powered from the GP-MC. It has no data storage. When the GP-MC requests data, the RPC converts its inputs and returns its results to the GP-MC via the RS485 interface.

RPC Remote Probe Controller Technical Specification 

2... Remote Powered Probe Controller (RPPC)

This device has three analog inputs. It is self powered. The RPPC reads it's probes at a period selected by the user on a dip switch inside the device. When the GP-MC requests data, the RPPC returns the results of the last reading to the GP-MC via the RS485 interface. 

The ordinary RPC Remote Probe Controller can supply up to 1mA for 30mSec at 3.6 volts to its probes and sensors. If the probes and sensors require more current, more time, or more voltage a RPPC Remote Powered Probe Controller must be used. The device can sample three analog inputs. Dip switches in the unit control the sample interval, the power up time for the probes before a sample is taken and the channel input mode (0~2V or 0~20mA). The unit holds the sample data until it is requested by the GP-MC on an RS485 Line.

RPPC Remote Powered Controller Technical Specification

 

This is a Frost Warning Device that monitors air temperature and triggers a flasher alarm as the temperature drops toward frost conditions. It is primarily used in orchards and vineyards that use helicopters to break up inversion layers and push warm air down in to areas that might frost. As supplied, the unit flashes as follows:

1 flash per two sec Temperature has dropped below 3º C

2 flashes per 2 sec Temperature has dropped below 2º C

3 flashes per 2 sec Temperature has dropped below 1º C

Flashing Stops Temperature as risen to above 5º C

These trigger temperatures are programmable.

The temperature probe of the RFF Remote Frost Flasher can be monitored and logged by a GP-MC

RFF Remote Frost Flasher Technical Specification