When the slave sends its response, it places its own address in thisĪddress field of the response to let the master know which slave is responding.Īddress 0 is used for the broadcast address, which all slave devices recognize. Master addresses a slave by placing the slave address in the address field of the The individual slave devices are assigned addresses in the range of 1 – 247. Valid slave device addresses are in the range of 0 – 247 decimal. The address field of a message frame contains two characters (ASCII) or eightīits (RTU). Technically the Modbus Spec only allows slave addresses 1 to 247 (246 total slaves). Address 0 is reserved as a "broadcast" address where the master can write to the slaves, however the slaves are not supposed to respond to broadcast requests.
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