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Interface Manual
Sentinel Modbus with 2DI
The SignalFire Sentinel Node is a device with the following features:
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RS485 connection to a single Modbus RTU sensor device
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Configurable Modbus register polling map
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Two digital inputs, perfect for high level alarms
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Reports state of dry contact inputs, open/closed, totalizer. Report on state change
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Can power an attached Modbus sensor at 5.3V or 7.6V with configurable warm-up time
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Low power operation from an on board DC-DC power supply
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Sends data to a SignalFire Buffered Modbus Gateway
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AES 128bit Encryption
Rev 1.9
SignalFire Model: Sentinel-485/2DI-DC
SignalFire Telemetry
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Summary of Contents for SignalFire Sentinel-485/2DI-DC
- Page 1 Interface Manual Sentinel Modbus with 2DI SignalFire Model: Sentinel-485/2DI-DC The SignalFire Sentinel Node is a device with the following features: RS485 connection to a single Modbus RTU sensor device Configurable Modbus register polling map Two digital inputs, perfect for high level alarms Reports state of dry contact inputs, open/closed, totalizer.
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Page 2: Specifications
WARNING: The use of any parts not supplied by the manufacturer violates the safety rating of the equipment. L’utilisation de toute composantes différentes du manufacturier élimine la sécurité intrinsèque du produit SignalFire Telemetry Rev 1.9... - Page 3 Markings Device Label DC Converter SignalFire Telemetry Rev 1.9...
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Page 4: Connections And Components
The ERROR LED (red) will blink to indicate an error condition. Scan/Checkin Button If this button is pressed the Sentinel will power the sensor on for the configured time, read the pre- configured Modbus registers from the sensor, and forward those values to the gateway. SignalFire Telemetry Rev 1.9... - Page 5 Modbus registers to be polled Modbus sensor power on time All settings are made using the SignalFire Toolkit PC application and a serial programming cable. WARNING: Perform the steps in this section (Setup) in a safe location only. Using the SignalFire Toolkit The SignalFire Toolkit application can be downloaded at www.signal-fire.com/customer.
- Page 6 ❶ COM Settings ❹ Register Values ❷ Node Information ❺ Current Program Steps ❸ Configurable Node Settings SignalFire Telemetry Rev 1.9...
- Page 7 To set up a legacy Sentinel to use encryption, click the checkbox labeled Enable Encryption inside the Set Corporate ID box. All newer Sentinels come with this option enabled with “signalfire” as the default encryption key. Corporate ID...
- Page 8 The Sentinel Modbus-2DI node will report the status of the digital inputs as a set of Modbus registers at its configured Modbus ID. The Sentinel may also be configured using the SignalFire Toolkit application with a list of Modbus registers to be read from the attached sensor. Note that the attached Modbus sensor must be set to the same Modbus ID as the Sentinel.
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Page 9: Sensor Connections
Sensor Connections Wiring Requirements Follow these guidelines when connecting sensors to the SignalFire node. See pictures for proper wire routing examples. Cables entering the enclosure must be run as pictured. DC power cable should be run through the cable gland and gland should be tightened. - Page 10 Tightening torque: max 0.4 N*m Sensor cable should be routed as shown Sensor Connection The Sentinel Modbus-2DI node has a single terminal block for connection to a Modbus sensor, and a separate terminal block for digital signals SignalFire Telemetry Rev 1.9...
- Page 11 The Sentinel has a current limiting resistor of 150 ohms. The voltage available to the sensor depends on the sensor current load. See the graphs below for details: SignalFire Telemetry Rev 1.9...
- Page 12 To enable the digital debounce, open the configuration window for the node in the SignalFire Toolkit and select Digital Input Debounce from the Settings menu. A typical value for a dry contact would be 100mS. Any extra counts due to contact bounce within the debounce time setting will be ignored.
- Page 13 The register address entered is subtracted by the offset in the Register Addressing Mode. The offset can be 0 or 1. For example, with One Based Addressing, a holding register of address 3990 should be entered as function code 0x03, address 3991. SignalFire Telemetry Rev 1.9...
- Page 14 Add New Program Step. If the step is valid, it will be added to the table. Finally, click Write New Program Steps to Device to save the changes. Note: In the legacy menu, the Register Addressing Mode is locked to One Based Addressing, so 3990 should be entered as 3991. SignalFire Telemetry Rev 1.9...
- Page 15 The Data Type pull-down only lists data types that support the register size and unsupported data types in the register list are changed to the default data type for the register size. SignalFire Telemetry Rev 1.9...
- Page 16 Remote Modbus Register Mapping The Sentinel node sends data to a SignalFire Telemetry Modbus Gateway. The data that is sent to the gateway is available at the gateway in registers where it can then be read by a Modbus RTU.
- Page 17 ATTENTION: Le produit Sentinel doit être installé dans un endroit libre de hautes vibrations. Sans quoi avec le temps, des possibles dommages pourraient compromettre la sécurité intrinsèque du produit. Les installations sur équipement en vibration constante (pompes, compresseurs) doit à tout prix être éviter. SignalFire Telemetry Rev 1.9...
- Page 18 Debug and configuration information is available if a connection is made via the debug port on the main board. A USB converter cable (available from SignalFire) must be used for this interface. Debug and advanced configuration may be done using the SignalFire Toolkit PC application.
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Page 19: Product Disposal Information
EPA’s battery disposal guide • EPA’s electronics recycling page • By following these guidelines, you help reduce waste and support environmental sustainability. Revision History Revision Date Changes/Updates 5/2/2024 Initial release – Forked from Sentinel Manual 11/1/2024 Add disposal information SignalFire Telemetry Rev 1.9... - Page 20 APPENDIX - FCC and IC Statements Changes or modifications not expressly approved by SignalFire Telemetry, Inc could void the user’s authority to operate the equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
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