RayTek GP Series Operating Instructions Manual page 22

External Reset Input
Pin Function
15 Reset
16 GND
Table 5: Wiring Sensing Heads or Input Devices
The External Reset Input is used to restart the "clock" for the
PeakHold/ ValleyHold/Averaging functions but not to reset the
values to 0. The reset can be activated by installing a switch between
terminals 15 and 16.
Use Table 6 when connecting either 0-5 V or 4-20 mA input devices
that can use the 24 VDC/50 mA power available from the monitor.
Make sure to unplug the unit before wiring devices or power!
GP Series
Thermocouple Input
Pin Function
4 Signal (-)
5 Signal (+)
Rev. F 10/2011
GP Monitor
15