Features

• LTE-M (Cat M1) - works with mobile networks worldwide
• Micro SIM card
• 5V to 20V input range
• Reverse polarity protection
• 10A latching relay - consumes no power to maintain state
• Very low power: <1mA @ 12V
• Built in current sensor - allows load current to be measured and reported
• Built in temperature sensor - allows ambient temperature to be measured and reported
• Alert reporting - events, like high temperature, can be reported without querying
• Timed delay ON/OFF - a delay time can be set to set/reset the relay after a delay time
• Controlled by SMS messages

Overview

The Syera remote relay operates on the LTE-M (Cat-M1) network worldwide. It is controlled by simple commands sent as SMS messges. A four digit pass code must be sent with each message to prevent false triggering of the command. Any received message that is not properly formed is discarded without any action taken.

The relay is a latching type which maintains state without drawing any power. The relay will maintain state through a power cycle as well.

The device integrates a current sensor. The current sensor measures instaneous load current. This can be helpful for battery powered deployments to determine current drain and subsequent remaining battery capacity.

The device integrates a temperature sensor. The temperature sensor measures ambient temperature near the device. This can be helpful especially when the deployment is enclosed and subject to high environment temperatures. Heat generated by nearby electronics (e.g. power supply) can cause a system to go into thermal shutdown. Keeping track of temperature may allow time to take action as necessary.

Commands

The general form of a command is PPPP,CMD[,ACTION][,OPTION], where:

• PPPP: the pass code
• CMD: the command code
• ACTION: the [optional] action to take
• OPTION: the [optional] parameter to qualify the ACTION

The following commands are supported. The examples show a pass code of 0000. Replace this with your pass code.

• Set Relay - 0000,REL,ON
  Sets the relay state (circuit is closed).
• Reset Relay - 0000,REL,OFF
  Resets the relay (circuit is open).
• Set Relay with Delay - 0000,REL,ON,nn
  Sets the relay state (circuit is closed) with a delay of nn minutes to turn the relay OFF. Sending a delay time of 0 will disable a previously set delay.
• Reset Relay with Delay - 0000,REL,OFF,nn
  Resets the relay state (circuit is open) with a delay of nn minutes to turn the relay ON. Sending a delay time of 0 will disable a previously set delay.
• Enable Alerts - 0000,ALERT,ON
  Enables alert messages to the recipent mobile number.
• Disable Alerts - 0000,ALERT,OFF
  Disables alert messages to the recipent mobile number.
• Set Alternative ON String - 0000,ALTON,Some on string
  Sets the alternative ON string. If the device receives a text message containing "Some on string" it will turn the relay on just as if the Set Relay command had been sent.
  Note the text message must begin with the pass code followed by either an underscore (_) or comma (,).
• Set Alternative OFF String - 0000,ALTOFF,Some off string
  Sets the alternative OFF string. If the device receives a text message containing "Some off string" it will turn the relay off just as if the Reset Relay command had been sent.
  Note the text message must begin with the pass code followed by either an underscore (_) or comma (,).
• LED On - 0000,LED,ON
  Enable the LED to flash network status.
• LED Off - 0000,LED,OFF
  Disable the status LED.
• Status Report - 0000,STAT
  Send a status report of current device status.
• Auto Status Reporting On - 0000,STAT,ON
  Enable sending a status report after every received command.
• Auto Status Reporting Off - 0000,STAT,OFF
  Disable auto status reporting.
• Set Pass Code - 0000,PWD,<new code>
  Sets a new pass code.
• Reset Pass Code - IMEI[6],PWD,RESET
  Resets the pass code to 0000. Use the last 6 digits of the IMEI number as the pass code.

SIM Installation

• Remove the antenna from the connector.
• From the cable end remove the 2 screws that hold the enclosure end cap. The cables do not have to be removed from the terminal blocks.
• Pull the circuit board assembly out of the enclosure.
• Insert the SIM card contacts down as shown below.
• Push the circuit board assembly back into the enclosure guides.
• Fasten the enclosure end cap with two screws.
• Reinstall the helical antenna.

Wiring and Power

The image shows a device that is powered separately from the load.

Status LED

The green status LED on the PCB provides an indication of network status. By default the LED will be enabled from a power on reset and will stay active for one minute after which time it will be disabled to conserve power.

• not registered : always on
• registered in idle: blinking 1s on and 2s off

Status Report

The status report will return the following information. The values shown are for illustrative purposes only.

• Version string
• IMEI number
• Relay State: ON/OFF
• Status LED: ON/OFF
• Status Report: ON/OFF
• Alerts: ON/OFF
• RSSI: -74 (CSQ: 20)
• Temp: 23.19 C
• Load current: 1.28 A
• Load voltage: 11.62 V
• AltON: [alternative ON string] or empty
• AltOFF: [alternative OFF string] or empty