Savin P7026 Manual do Utilizador descarregar pdf (Página 73)

PET-70216/ET-7026 User Manual, version 1.0.1 beta1, Page: 73

4.2.1. Address

The first byte of information in the message structure of Modbus is the receiver‟s

address. The valid addresses are in the range of 0 to 247. Addresses from 1 to 247

are given to individual Modbus devices and 0 is used for broadcast.

Reference

Description

0xxxx

Read/Write Discrete Outputs or Coils. A 0x reference

address is used to device output data to a digital output

channel.

1xxxx

Read Discrete Inputs. The ON/OFF status of a 1x reference

address is controlled by the corresponding digital input

channel.

3xxxx

Read Input Registers. A reference register contains a 16-bit

number received from an external source --- e.g. an analog

signal.

4xxxx

Read/Write Output or Holding Registers. A 4x register is

used to store 16-bits of numerical dada (binary or decimal),

or to send the data from the CPU to an output channel.

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 121 122

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