Temperature (OWT)

Description and Card Type: 0 or 5:

The type 0, 1-wire card uses the DS18S20 IC to measure temperature over the range of -55 to +125 degrees C. The type 5, 1-wire card uses the DS2438 IC to measure temperature over the range of -40 to +85C. The probe is mounted inside a radiation shield that can be hung from the ceiling or a cross arm. The probe can be used to measure indoor or outdoor temperature for applications such as greenhouse temperature control.

OWconfig:

The "Type" must be 0 or 5 depending on what is written on your tag. The "Mode" must be "1-wire power" for a type 0. The mode can be either "Separate power" or "1-wire power" for a type 5. For a type 0 temperature probe short pins 1 and 2 of the 1-wire connector (+5V to common pin). The scan time will be 750 mS per temperature probe.

Modbus Register Information:

This device has one Modbus input register on the ICONIO board that contains the temperature reading.

Type	Modbus Range	Conversion
0	0-360	F=0.9*raw-67 C=0.5*raw-55
5	0-5760	F=0.05625*raw-67 C=0.03125*raw-55

Specifications:

Type	Parameter	Specification
0	Temperature Range	-55 to +125C (-67 to +257F)
0	Accuracy	+/- 0.5 C from -10 to +85C; +/-2.0C outside this range
0	Resolution	0.5C
0	Conversion time	750mS
5	Temperature Range	-40 to +85C (-40 to +185F)
5	Accuracy	+/-2.0C
5	Resolution	0.03125C (0.05625F)
5	Conversion time	10mS