© 2017 EnOcean | www.enocean.com
Sub GHz Transmitter Modules User Manual May 2017 | Page 23/35
USER MANUAL
PTM 330 / PTM 335 / PTM 330U / PTM 430J
Sub GHz Transmitter Modules
3.2
How to generate an equivalent energy pulse
PTM transmitter module can also be operated from an external equivalent energy pulse.
As the source impedance is not known a procedure is defined how to find the needed dura-
tion of the pulse. The pulse must provide a voltage between 5 V and 6 V for maximum 10
ms time.
The length of this supply pulse needs to be defined by measuring the remaining voltage on
the storage capacitor after the 3rd sub-telegram, according to the following procedure:
1)
Discharge the storage capacitor (see photo) completely
2)
Apply a short pulse, voltage between 5 V to 6 V which charges the capacitor
3)
Measure the voltage drop at the storage capacitor to ground (between pin 13 and
pin 12) while the sub-telegrams are being transmitted with an oscilloscope
4)
The remaining voltage shortly after the 3rd sub-telegram should be 2.5 to 3.0 V
3.3
How to solder additional teach-in button (PTM 335 only)
On PTM 335 there is are not populated pads – SECURE and VCC. By mounting a push but-
ton on them the PTM 335 can have a teach-in button. By pressing the button and triggering
the ECO the secure teach-in process is triggered and the module switches to secure mode.
By repeated pressing the button will retransmit the secure message. To switch to the stan-
dard mode the STANDARD and VCC pin must be connected. There is no push button option
available for this step.
storage capacitor
5
10
15
20
25
30
35
40
0
1
2
3
4
5
6
ms
V
1st
2nd
3rd
2.5-3.0V
