HF Elfin-EG41 - 2.2. Elfin-EG41 Pin Definition

Elfin-EG41 用户手册
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2.2. Elfin-EG41 Pin Definition
Figure 2. Elfin-EG41 RJ45 Interface Pin
Elfin-EG41 Interface Definition
Pin
Description
Net Name
Signal Type
Notes
1
UART_TX
TTL Voltage
TTL_UART_
TXD
O
3.3V TTL UART Output
2
UART_RX
TTL Voltage
TTL_UART_
RXD
I
3.3V TTL UART Input
3
NC
Please leave it open
4
NC
Please leave it open
5
RS485_A+
RS485_A+
IO
RS485 A+
6
RS485_B-
RS485_B-
IO
RS485 B-
7
Power VCC
VCC
Power
9～18VDC
8
Power GND
GND
Power
9
Green LED
Net Status
Net
O
Boot On: Power is OK.
2s Off -> 2s On: cellular network Register
is OK.
0.1s Off -> 0.1s On: cellular network data
is transferring.
10
Amber LED
Data Transfer
Active
O
Off: No data transfer
0.3s Off -> 0.9s On: UART TX Output
0.3s Off -> 0.3s On: UART RX Receive
On: UART bidirection.
<Notes>:
I — Input; O — Output; Power—Power Supply
Note
PIN1/2 is TTL UART, PIN5/6 is RS485 interface, it is same UART for internal MCU, just the
hardware driver is different. Choose either TTL or RS485