Hi-Link HLK-RM58S User Manual page 6

Pin Network Name
1 GND
2 GPIO0
3 NC
4 UART_RXD1
5 UART_TXD1
6 NC
7 NC
8 NC
9 NC
10 NC
11 NC
12 NC
13 NC
14 NC
15 NC
16 NC
17 NC
18 NC
19 NC
20 NC
21 NC
22 NC
23 NC
24 VCC_5V
25 GND
26 VDD_3V3
Type
Ground Ground
ES0 pin, pull down 1 second, serial 0 into AT
I/O command mode ;Pull down ≥ 8 seconds, restore
factory default parameter settings
NC
I Serial port 1 receiving
O Serial port 1 sending
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
P External power supply pin 1: 5V @ 500mA
GND Ground
External power supply foot 2: 3.3V @ 500mA
P
External power pin: 3.3V @ 200mA
3
Explanation