User's Manual

USER MANUAL

PTM 215B – 2.4 GHZ Pusbutton Transmitter Module

2.5 PTM 215B radio channel parameters

PTM 215B transmits advertising telegrams within the 2.4 GHz radio frequency band

(2402MHz … 2482MHz) using the BLE advertising frame format.

By default, PTM 215B will use the three BLE advertising channels (Channel 37, 38 and 39)

defined for transmission.

Table 1 below summarizes the radio channel assignment within the BLE standard.

Table 1 – Radio channel parameters

The transmission of a radio telegram on all three advertising channels is called an Advertis-

ing Event. In order to further increase communication reliability, more than one Advertising

Event might be transmitted for an individual radio telegram.

2.5.1 PTM 215B radio transmission sequence

PTM 215B transmits radio telegrams using so-called Advertising Events.

An advertising event is defined as the transmission of the same radio telegram on all se-

lected radio channels (by default this would be on BLE Channel 37, 38 and 39) one after

another with minimum delay in between.

For reliability reasons, PTM 215B will send several (minimum two, maximum three) adver-

tising events for each button input. The resulting transmission sequence is shown in Figure

5 below.

Figure 5 – Radio transmission sequence