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The SignalFire Modbus-in-a-Stick has the following features:
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RS485 connection to Modbus devices (RS232 Modbus interface can be special ordered)
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Wide range DC power input. 6 to 36VDC
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Configurable check-in period and network address
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Configurable Modbus register polling and/or transparent register mode
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Modbus register writes to remote nodes
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Full time mesh node can forward messages from other SignalFire devices including sleeping
nodes
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Sends data to SignalFire Modbus Gateway
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Integrated 500mW FHSS 900MHz ISM band radio and high gain antenna
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AES 128bit Encryption
Rev 5.8
Interface Manual
Modbus-Stick
SignalFire Number: MBS-CBBL
SignalFire Telemetry
1
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Summary of Contents for SignalFire Modbus-Stick
- Page 1 Configurable check-in period and network address Configurable Modbus register polling and/or transparent register mode Modbus register writes to remote nodes Full time mesh node can forward messages from other SignalFire devices including sleeping nodes Sends data to SignalFire Modbus Gateway...
- Page 2 The Modbus-in-a-Stick has one LED available for field diagnostics. Description Slow Flash (3 second pause) System is running and in communication with radio network Fast Flash (0.5 second pause) System is running but no network found Solid On System Fault, needs service Rev 5.8 SignalFire Telemetry...
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Page 3: Operation
If the register value is not buffered, but the Modbus slave ID is known, the request is forwarded over the SignalFire wireless network to the Modbus sensor, the response is forwarded back to the gateway and delivered to the RTU. Due to the multi-hop wireless network, latency will be introduced. - Page 4 Setup The Modbus-in-a-Stick requires initial configuration over the debug port. This is done using the SignalFire Toolkit PC application to configure the device over a serial port. The following items must be configured: Network Selection / encryption settings Check-in Period Selection (Pre-Configured Register set mode only)
- Page 5 Configuration To begin configuration, open the SignalFire Toolkit. The SignalFire Toolkit application can be downloaded at www.signal-fire.com/customer. After installation, launch the software and the main toolkit window will open: Select the COM port associated with the Modbus Stick and click “Auto-Detect Device on COM Port.”...
- Page 6 Modbus-in-a-Stick configuration window Rev 5.8 SignalFire Telemetry...
- Page 7 If you are setting up a new network, you will need to set the encryption key on all of your devices. If you are adding a Modbus-Stick to a legacy network, you can simply set the Corporate ID without clicking the Enable Encryption box, and it will remain compatible with the older system.
- Page 8 Setting the encryption key to be unrecoverable. System Check-In Period This setting controls how often the node will read the Modbus device and forward the register data to the gateway. Rev 5.8 SignalFire Telemetry...
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Page 9: Rs-485 Modbus Communication
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. Keep in mind that one 32-bit floating point register Rev 5.8 SignalFire Telemetry... - Page 10 Click ‘READ Registers’ to read the current Modbus registers from the device. The Data Type and Register Value fields can be edited, and the changes will be highlighted. Click WRITE Registers to write the changes to the Modbus registers in the device. Rev 5.8 SignalFire Telemetry...
- Page 11 The Data Type pull-down only lists data types that support the register size (Figure 7, Figure 8) and unsupported data types in the register list are changed to the default data type for the register size. Rev 5.8 SignalFire Telemetry...
- Page 12 9998 or 65535 Remote device type (0 for Modbus Client Node) Revision History Revision Date Changes/Updates 7/23/13 6/24/15 Updated Design 8/3/16 Added section on encryption 3/31/20 Remote Modbus R/W 7/9/2020 Updated Modbus program steps menu, new checkin register Rev 5.8 SignalFire Telemetry...
- Page 13 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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