STI-MM06 Data Sheet

Overview

The Synaptic Technologies STI-MM06 is a multi-function MIOTY™ sensor node. The STI-MM06 offers 6 measurement parameters, including air temperature, air pressure, humidity, acceleration, discrete circuit status and analog circuit status.

The STI-MM06 includes an internal 3.6v battery pack capable of powering the device for up to 6 years, depending on configuration and environmental conditions. The internal battery pack is not rechargeable, but can be replaced with the STI-BT5200 replacement battery.

MIOTY™ wireless transmission range of the STI-MM06 is up to 15km line-of-sight to the MIOTY™ Gateway, or up to 5km in urban environments.

Intended use of the STI-MM06 include indoor environmental monitoring, bump-sensing and monitoring existing discrete or analog circuits.

The STI-MM06 is available in 916Mhz version for North America and an 868Mhz version for use in Europe.

Measurement Parameters

Physical Characteristics

Battery

The STI-MM06 is powered by a replaceable, internal battery pack. Replacement battery packs are supplied by Synaptic Technologies: order code STI-BT5200.

Data Packet

Data packets are transmitted using the MIOTY™ protocol. Transmissions can be triggered by timer, by change on discrete input or when a bump is detected by the internal accelerometer. The STI-MM06 transmits a consistent data packet, containing all data points, on every transmission regardless of the transmission trigger.

RF Characteristics & Antenna

Message Transmission Triggers

The STI-MM06 offers several mechanisms for triggering RF transmissions:

Timer

The STI-MM06 can be configured to transmit messages every ~1m, ~5m, ~15m or ~60m.

Unless a configuration was specified at the time of order, the STI-MM06 will be configured to transmit a data packet every ~1m.

See Configuration Options in this document for details on changing the data transmission timer.

Wake-on-Bump

The STI-MM06 offers a user-configurable trigger to transmit a message when the internal accelerometer detects an acceleration of 1.5g or greater.

Unless a configuration was specified at the time of order, the STI-MM06 will be configured with the Wake-on-Bump feature active by default.

See Configuration Options in this document for details on configuring the Wake-on-Bump feature.

Wake-on-Change

The STI-MM06 transmits a message whenever a change to either of the 2 discrete inputs is detected.

Wake-on-Change functionality is not user configurable.

Configuration Options

The STI-MM06 offers configuration options selectable via three internal DIP switches.

To access configuration DIP switches:

Move power switch to the OFF position
Remove antenna or SMA cable
Remove 4 case screws
Lift cover from the base, exposing the battery and circuit board

To reassemble your STI-MM06, follow these instructions in reverse order.

DIP switches 1 and 2 control the message transmission timer interval. Users may select between 4 intervals: ~1m (actual: 1m18s), ~5m (actual 4m46s), ~15m (actual: 13m31s) and ~60m (actual: 55m12s). Select the desired timer interval from the following chart:

Transmitting a message draws additional power from the internal battery. For longest battery life, select the longest message transmission interval that will meet your requirements.

Wake-on-Bump can be activated using DIP 3 as follows:

The Wake-on-Bump feature requires the internal accelerometer remain powered at all times, drawing power from the internal battery. For extended battery life, disable the Wake-on-Bump feature.

Unless a configuration was specified at the time of order, the STI-MM06 is configured by default as DIP 1: ON, DIP 2: ON, DIP 3: ON.

Custom Configurations

Synaptic Technologies offers the STI-MM06 in custom configurations beyond the user-accessible configuration options documented within this document. Additional charges may apply to custom configurations.

Please contact Synpatic Technologies by email: info@synaptictec.ca or by telephone: 1-705-692-0101 x.252 for more information on custom configurations.

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Discrete Inputs

The STI-MM06 offers 2 discrete inputs. These inputs are self-powered and detect contact closure. These inputs are suitable for detecting the position of a switch, pushbutton, microswitch, reed switch or for connecting to the relay output of a PLC (or similar.)

Note: As self powered inputs, the discrete inputs can slightly reduce battery life if connected to normally closed circuits. Battery life is maximized when the discrete inputs are connected to normally open circuits, or when not connected.

Analog Input

The STI-MM06 is equipped with a 2v analog input suitable for measuring voltages in circuits or analog sensors with 0-2vDC output. The analog input is not powered — the sensor (or circuit) must provide voltage for the STI-MM06 to measure on the analog input terminals.

For a positive value, a sensor must be connected correctly to the + and – terminals. If a sensor is connected in reverse (sensor + to STI-MM06 -, sensor – to STI-MM06 +), the STI-MM06 will report a negative value on the analog input.

Analog value is reported as a signed 16-bit integer. The formula to translate the 16-bit value to voltage is as follows:

voltage = (int16_t)value / 16383.5

The maximum value reported by the STI-MM06 is (int16_t) 32,767 and occurs at 2.00vDC. Maximum input voltage on the STI-MM06 input is 2.30vDC, however the value reported by the STI-MM06 will remain 32,767 above 2.00vDC.

Figure 1 depicts a 0-2v sensor connected to the STI-MM06 Analog input.