Ebyte E831-RTU Series User Manual Download Page 19

Page: 19 / 21

Chengdu Ebyte Electronic Technology Co.,Ltd.

E831-RTU(8080T-485) User

Manual

，

Chengdu Ebyte Electronic Technology Co.,Ltd.

Clear the pulse count value of DI2 and DI4, and keep the pulse count value of DI1 and DI3. The written value should be 0x0a,

the corresponding binary value is 0000 1010, the pulse count value of Modbus RTU protocol clear

sen

00 40

00 0a

08 19

Device

ModBus address

functi

on code

address

write value

CRC check

code

ake

over

00 40

00 0a

08 19

Device

ModBus address

funct

ion code

address

write value

CRC check

code

4.3.2 Automatic reporting of digital input DI

The automatic reporting function of digital input is to transmit the change value when the switch value changes. You can

choose to transmit through RS485 or GPRS, or you can turn off the automatic reporting function.

The Modbus register corresponding to the automatic reporting setting of the switching value is 40081 (0x0050), the value

corresponding to the function: 0, the automatic reporting function of the switching value is turned off

1. The switch value is automatically reported and transmitted through RS485

The switch value change upload protocol is listed in the following table, in which the frame header 0xAA and0xBB are fixed.

When the counting mode is set to level counting, the value range of DI1 ,DI2 ,DI3 , DI4 , DI5, DI6, DI7, DI8 is 0x00 , 0x01 , 0xFF,

where

0x00 means the digital input is disconnected,

0x01 means the digital input is closed,

0xff means that the digital input has not changed,

The values

of DI1 to DI8 in the table represent that the status of DI1, DI2, DI5, DI6, DI7, DI8 is updated to open, the status

of DI3 is updated to closed, and the status of DI4 has not changed. The last two bytes are the modbus CRC16 calculation value.

Note: When set to rising edge counting mode, trigger once, DI value is 00, when set to falling edge counting mode, trigger

once, DI value is 01. Also 0xff means no change.

frame

header

DI2

DI5

DI6

DI7

DI8

Modbu

s CRC

0xAA

0xBB

0xf

0x00

0x05

0x97

4.3.3 Digital output DO time setting

The switch pulse output time setting is to set the digital output time. The corresponding Modbus register is 40083 ( 0x0052 ), and its value range is

100-65535ms . If the value is lower than 100ms , the default digital output is closed to hold state, that is, the digital It remains on after the output is closed. If it is set to 100ms and

above , such as 500ms , after sending the digital output close command, the switch value will be closed for 500ms, and then automatically disconnected after 500ms.

4.3.4 Switch DO restart output state setting

Whether the device keeps the state before power off or restarts to keep the specific output state, this function is only valid when the

device digital output time setting register value is

less than 100ms .

The Modbus register corresponding to the switch restart output state setting is 40085 ( 0x0054), and its value range is 0x00-

0x100 . When the value of this register is 0x100 , the last digital output state is maintained after power off and restart; when the value

of this register is 0x00-0xFF , the lower 8 bits determine the digital output state of the device restarting, bit6 corresponds to DO6, bit5

corresponds to DO5, bit4 corresponds to DO4, bit1 corresponds to DO1, such as when the power is turned on, DO4, DO2 are in the

closed state, DO3, DO1 and other ports are in the open state, the corresponding register value is 0000 1010 , that is, 0xa0, "1" is the

closed state , "0" is disconnected.