Sutron 8310 - Page 88

Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 88
The sensor in this application contains 2 resistors in series, forming one half of a wheatstone
bridge. The add-on board forms the other, reference side of the bridge circuit.
This input type is capable of producing one of two different outputs, either “R1/R2”, or “R1+R2”,
as selected in the DiffResParam property. The ratio R1/R2 gives an indication of strain, while
R1+R2 can be used to determine temperature of the probe.
This input type is typically used with the Differential Resistance measurement type, to take
R1+R2 and R1/R2 and translate them into a measurement of stress/strain, displacement, and
temperature.
MBSensor
The MBSensor input implements a Modbus Master for reading a Modbus sensor. Both serial and
TCP/IP are supported.
DeviceID
Specifies the Device ID of the modbus slave from which to read the value.
Note: when using a device type of TCP/IP (i.e., ModbusTCP), the DeviceID field is
typically irrelevant. However, some ModbusTCP devices are known to require a value of
either 0 or 255. Hence, if the device appears not to respond when using the default
DeviceID of 1, try either 0 or 255. In addition, when using a serial bridge, DeviceID is
often used to specify the address of the destination device on the serial bus.
TargetRegister
Specifies the base register number to read from the target device. Note: in the 8310,
modbus register nunbers always start at 1 (not 0).
ValueType
Specifies the type of value to read from target device. Possible values are:
float 32 bit floating point, uses two consecutive registers
int signed 32 bit integer, uses two consecutive registers
uint unsigned 32 bit integer, uses two consecutive registers
short signed 16 bit integer, uses one register
ushort unsigned 16 bit integer, uses one register
MSW
For multi-register value types (int, uint, and float), determines which register is used to
contain the most significant word (MSW) of the value. When set to “Low Reg”, the