User's Manual

Table Of Contents

USER MANUA

V0.6

STM 320 / STM 320C / STM 321C

4.2 FCC (United States) certification

STM 320C LIMITED MODULAR APPROVAL

This is an RF module approved for Limited Modular use operating as an intentional trans-

mitting device with respect to 47 CFR 15.231(a-c) and is limited to OEM installation. The

module is optimized to operate using small amounts of harvested energy from a small solar

cell exposed to ambient light. The module transmits short radio packets comprised of con-

trol signals, (in some cases the control signal may be accompanied with data) such as

those used with alarm systems, door openers, remote switches, and the like. The module

does not support continuous streaming of voice, video, or any other forms of streaming

data; it sends only short packets containing control signals and possibly data and is pow-

ered by a solar cell in ambient light. The module is designed to comply with, has been

tested according to 15.231(a-c), and has been found to comply with each requirement.

Thus, a finished device containing the STM 320C radio module can be operated in the

United States without additional Part 15 FCC approval (approval(s) for unintentional radia-

tors may be required for the OEM’s finished product), under EnOcean’s FCC ID number.

This greatly simplifies and shortens the design cycle and development costs for OEM inte-

grators.

The module can be triggered manually or automatically, which cases are described below.

Manual Activation

The radio module can be configured to transmit a short packetized control signal if

triggered manually. The module can be triggered, by pressing a button, for example.

The packet contains one (or more) control signals that is(are) intended to control

something at the receiving end. The packet may also contain data. Depending on

how much energy is available from the energy source, subsequent manual triggers

can initiate the transmission of additional control signals. This may be necessary if

prior packet(s) was (were) lost to fading or interference. Subsequent triggers can

also be initiated as a precaution if any doubt exists that the first packet didn’t arrive

at the receiver. Each packet that is transmitted, regardless of whether it was the

first one or a subsequent one, will only be transmitted if enough energy is available

from the energy source.

Automatic Activation

The radio module also can be configured to transmit a short packetized control sig-

nal if triggered automatically, by a relevant change of its inputs, for example. Again,

the packet contains a control signal that is intended to control something at the re-

ceiving end and may also contain data. As above, it is possible for the packet to get

lost and never reach the receiver. However, if enough energy is available from the

energy source, and the module has been configured to do so, then another packet or

packets containing the control signal may be transmitted at a later, unpredictable

time.