Chengdu Ebyte Electronic Technology Co.,Ltd.
E220-400R30D User Manual
Copyright ©2012–2021
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
7
1
VCC
Input
Module power supply is referenced, voltage range: 4.5 to 5.5V DC
2
GND
Input
Module ground line
3
485A
Input/Output A of the RS485 interface, A of the external RS485 device
4
485B
Input/Output B of the RS485 interface, B of the external RS485 device
5
STB
Output
Low when idle, high for configuration and sending&receiving
6
Sending Light
-
Green, the light flashes when data is sent
7
Receiving
Light
-
Blue, the light flashes when data is sent
8
Fixed holes
-
Fixed holes
9
RF interface
-
SMA-K, equivalent impedance is about 50 s
10
Fixed holes
-
Fixed holes
11
Fixed holes
-
Fixed holes
4 Recommended wire diagram
No.
Description of the module's brief connection to the 485 device
1
RS485 interface A, external RS485 device A; RS485 interface B, external RS485 device B
2
The STB pin can be connected with an indicator (note the series flow limit resistance) as an indication that the module
is working properly; You can also not answer.
3
Direct access to the 433MHz/470MHz antenna at the RF interface.