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# SensorModbusMaster<!-- {#mainpage} -->
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# SensorModbusMaster<!--! {#mainpage} -->
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This library is designed to use an Arduino as a Modbus master to communicate with a sensor/slave via the [Modbus RTU](https://en.wikipedia.org/wiki/Modbus) communication protocol.
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It's specifically written with lots of "higher-level" functions to help out users who are largely unfamiliar with the Modbus protocol and want an easy way to get information from a Modbus device.
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- All input registers are read-only.
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If your map says a register is read/write (R/W), it is a holding register.
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- the register or coil number the data is stored in
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- the format of data within the registers/coils (ie, float, integer, bitmask, ascii text)
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- the format of data within the registers/coils (ie, float, integer, bit mask, ascii text)
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- whether multi-register numeric data is stored as ["big-endian" or "little-endian"](https://en.wikipedia.org/wiki/Endianness) values (That is, is it high _word_ first or low _word_ first.
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There are no specifications for this.)
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- whether single-register data is stored "big-endian" or "little-endian" (That is, is it high _byte_ first or low _byte_ first.
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## Hardware interface suggestions for EnviroDIY Mayfly
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For use with the [EnviroDIY Mayfly datalogger](https://github.com/EnviroDIY/EnviroDIY_Mayfly_Logger) and other Arduino framework boards, you will likely need some additional [Hardware for using ModbusRTU with RS-485 on Arduino](https://github.com/EnviroDIY/SensorModbusMaster/tree/master/hardware).
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For use with the [EnviroDIY Mayfly data logger](https://github.com/EnviroDIY/EnviroDIY_Mayfly_Logger) and other Arduino framework boards, you will likely need some additional [Hardware for using ModbusRTU with RS-485 on Arduino](https://github.com/EnviroDIY/SensorModbusMaster/tree/master/hardware).
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We have developed a [Modbus-Mayfly-WingShield](https://github.com/EnviroDIY/SensorModbusMaster/tree/master/hardware/Modbus-Mayfly_WingShield) that combines AltSoftSerial TTL to RS-485 conversion with an optional power boost to 9V or 12V.
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This has worked quite well for us for a variety of deployment configurations and sensors.
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