E850-DTU(4440-GPRS) datasheet
Copyright ©2012–2018
，成都亿佰特电子科技有限公司
10
3 indication
8
DI 4
switch input channel
4 indication
Green LED, lights up when DI 4 and DIG are shorted
9
DO 1
Relay 1 output
indication
Green LED, lights up when NO 1 and COM 1 close
10
DO 2
Relay 2 output
indication
Green LED, lights up when NO 1 and COM 1 close
11
DO 3
Relay 3 output
indication
Green LED, lights up when NO 1 and COM 1 close
12
DO 4
Relay 4 output
indication
Green LED, lights up when NO 1 and COM 1 close
13
NET
Network indication
Yellow LED, Constantly bright after entering network
14
DATA
Serial data indication
Yellow LED, Lights up when the RS485 interface has
data transmission (blinking)
15
WORK
Work/Reset
indication
Yellow LED
，
Regular blinking / quick blinking after
successful reset
16
PWR
Power indication
Red LED, Constantly bright
Note: Grounding: It is recommended to connect the case to the ground
2.3 Reload button description
Long press 5S is valid, after the reset is successful, the WORK led
blinks
quickly, and the Modbus
device address, RS485 serial port baud rate and parity bit are restored to the factory settings.
3. Modbus
3.1 Register Address Table
Register Address Table
（
Function code: 0x01H
、
0x05H
、
0x0FH
、
0x03H
、
0x06H
、
0x10H
）
Register
address
Number of
registers
Register properties
Register
type
Register value
range
Function code
supported
00017
(0x0010)
1
DO1 switch output
Read/Write
0x0000 or
0xFF00
（
0x05
function code
）
0-1
（
0x01
、
0x0F function
code
）
0x01
0x05
0x0F
00018
(0x0011)
1
DO2 switch output
Read/Write
00019
(0x0012)
1
DO3 switch output
Read/Write
00020
(0x0013)
1
DO4 switch output
Read/Write
Reserve
10017
(0x0010)
1
DI1 switch intput
Read only
0-1
0x02
10018
(0x0011)
1
DI2 switch intput
Read only
