User's Manual

USER MANUAL PREVIEW

PTM 535BZ – BLUETOOTH AND ZIGBEE GREEN POWER PUSHBUTTON TRANSMITTER

3.4.1.1 Input status encoding

The INPUT_STATUS field within the data telegram payload identifies the ECO 200 action (press

or release) and the status of the external signals INPUT1 and INPUT2 (connected to GND or

not connected to GND). PTM 535BZ uses the following sequence to identify and transmit

button contact status:

1. Determine direction of the ECO 200 movement (press or release)

2. Read status of INPUT1 and INPUT2 signals

3. Calculate data payload and authentication signature

The ECO 200 action (press or release) is indicated by Bit 0 of the INPUT_STATUS field. As

described in Chapter 2.4.1, the default behaviour is that a press action is a move of the ECO

200 spring away from the PCB and a release action is a move of the ECO 200 spring towards

the PCB. This default behaviour can be inverted using the NFC interface if required (so that

a press action would be a move of the ECO 200 spring towards the PCB and a release action

would be a move of the ECO 200 spring away from the PCB).

If INPUT1 or INPUT2 are connected to GND while ECO 200 is actuated (press action or release

action), then this is indicated by the according status bit set to ‘1’. The structure of the

INPUT_STATUS field used in BLE data telegrams is shown Figure 15 in below.

Figure 15 – INPUT_STATUS structure

Table 2 below summarizes the default INPUT_STATUS encoding for the eight possible com-

binations of ECO 200 action, INPUT1 status and INPUT2 status.

INPUT2 Status INPUT1 Status ECO 200 INPUT_STATUS

Not connected Not connected Press 0x01

Not connected Not connected Release 0x00

Not connected Connected to GND Press 0x03

Not connected Connected to GND Release 0x02

Connected to GND Not connected Press 0x05

Connected to GND Not connected Release 0x04

Connected to GND Connected to GND Press 0x07

Connected to GND Connected to GND Release 0x06

Table 2 – Default INPUT_STATUS encoding