The Pressac Sensing Under Desk PIR Sensor will send a telegram indicating presence has been detected as soon as the first movement is seen.


If no further movement is detected, for the absence time-out period then an absence detected telegram will be transmitted.


Once absence has been detected any detection of movement will result in a presence detection telegram being sent immediately.


If there is no change in state for the repeat time period, then a repeat telegram indicating the last state will be transmitted.


With the unit in walk test mode, a presence detected telegram will be transmitted every time movement is seen (Max, one telegram every 0.5 seconds).


Learn Button


The learn button is located in a hole next to the LED and PIR shield, a tool to press this button is supplied with the mounting kit.


DIP Switch's


The DIP switches are located behind the battery cover as shown below.



DIP Switch Functions


DIP Switch

Function

State

Description

1

LED Enable

OFF

LED Flash off (still flashes in walk test mode and learn pressed)

ON

Led flash on telegram transmission

2

Absence Timeout

OFF

Un-occupied message sent after 3 minutes

ON

Un-occupied message sent after 11 minutes

3

Repeat Time

OFF

Repeat message of last state after 20 minutes

ON

Repeat message of last state after 4 hours

4

Walk Test Mode

OFF

Walk test mode off

ON

Walk test mode on- will send a message every time movement is detected

5

Not Used

OFF

Reserved for future use

ON

Reserved for future use

6

Battery

OFF

Device power off

ON

Device power on


The value of data byte 1 in the transmitted telegram for the different types of telegrams is as follows.


Absence telegram

0x00

Detection telegram

0xFF

Walk test telegram

0xFD

Repeated unoccupied

0x0A

Repeated occupied

0xFA