Spectrum Controls 1769sc-IF8u - Manual (Page 52)

42 Compact IO ™ Universal Input module
Enabling 2/4 Wire RTD (Bit 15)
Setting bit 15 to a one enables 2/4 wire RTD on the associated channel.
Note: Bits 14 and 15 are used for RTD and resistance modes only. They
are used to specify 2, 3, or 4 wire RTD modes. 2-wire RTD mode is
implemented when cyclic lead compensation (bit14) is disabled and 2/4-
wire(bit15) is enabled 3-wire RTD and resistance is implemented by
enabling cyclic lead compensation and disabling 2/4 wire. 4-wire RTD or
resistance is implemented by enabling 2/4 wire and disabling cyclic lead
compensation.
Number of Wires Bit 15 Bit 14
2 1 0
3 0 1 or 0
4 1 0
Disabling Cyclic Lead Compensation (Bit 14)
Setting bit 14 to a one disables cyclic lead compensation.
Note: Bits 14 and 15 are used for RTD and resistance modes only. They
are used to specify 2, 3, or 4 wire RTD modes. 2-wire RTD mode is
implemented when cyclic lead compensation (bit14) is disabled and 2/4-
wire(bit15) is enabled 3-wire RTD and resistance is implemented by
enabling cyclic lead compensation and disabling 2/4 wire. 4-wire RTD or
resistance is implemented by enabling 2/4 wire and disabling cyclic lead
compensation.
Number of Wires Bit 15 Bit 14
2 1 0
3 0 1 or 0
4 1 0
Selecting Data Formats (Bits 13 through 11)
This selection configures channels 0 through 7 to present analog data in
any of the following formats:
Engineering Units x 1
Engineering Units x 10
Raw/Proportional Data
Scaled for PID
Percent Range