Ebyte E78-DTU(470LN22) User Manual page 36

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Chengdu Ebyte Electronic Technology Co., Ltd.

e will be sent again.

2. Data sending status prompt

OK+SEND:TX_LEN indicates that the data sending request is suc

cessful, TX_LEN: 1Byte, the length of the data sent

OK+SENT: TX_CNT means that the data is sent successfully, TX

_CNT: 1Byte, the number of data sending.

ERR+SEND:ERR_NUM indicates that the data sending request fai

led, and the reason is indicated by ERR_NUM. ERR_NUM: 1Byt

0- Not connected to the network

1- Communication is busy, send request failed

2- The data length exceeds the current sendable length, only send

the MAC command

ERR+SENT: TX_CNT indicates that the data transmission failed,

and the number of transmissions reaches the maximum number. T

X_CNT: 1Byte, the number of data transmissions.

OK+RECV:TYPE,PORT,LEN,DATA Data received successfully (res

ponse message or active downlink data received)

TYPE: 1Byte, downlink transmission type

Bit0: 0-unconfirm, 1-confirm

Bit1: 0-Not ACK, 1-ACK

Bit2: 0-not carried, 1-carried, indicating whether the downlink data

carries the LINK command response

Bit3: 0-not carried, 1-carried, indicating whether the downlink data

carries the TIME command response, only when the bit is 1, it

means the time synchronization is successful

Bit4~Bit7: Default 0, reserved

PORT: 1Byte, downstream transmission port

LEN: 1Byte, downlink data length

DATA: nByte, downstream data, when LEN=0, this field does not

exist.

E78-DTU(470LN22) User Manual

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