RayTek MI Miniature Infrared Sensor - Manual (Page 31)

Installation
MI 23
5.4 Inputs FTC
The three inputs FTC1, FTC2, and FTC3 are used for the external
control of the unit.
All input functions are enabled through the DataTemp
MultiDrop software only, see the software help for
complete set up instructions!
FTC1 FTC2 FTC3
Emissivity (analog control) x
Emissivity (digital control) x x x
Ambient Background Temperature Compensation x
Trigger x
Hold Function x
Table 3: Overview to the FTC Inputs
Figure 13: FTC Inputs on the Electronic Board