Hi-flying Elfin-EG4X Посібник користувача - Сторінка 11

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Elfin-EG4X 用户手册
Pin
Description
6
RS485_B-
7
Power VCC
8
Power GND
Green LED
9
Net Status
Amber LED
10
Data Transfer
<Notes>:
I — Input; O — Output; Power—Power Supply
Note
PIN1/2 is TTL UART, PIN5/6 is RS232/RS485 interface, it is same UART for internal MCU, just
the hardware driver is different. Choose either TTL or RS232/RS485

2.4. RS232 Interface

RS232 don't have hardware flow control function, and the physical voltage is ±8V.

2.5. RS485 Interface

RS485 use two wire links, A(DATA+), B(DATA-). Connect A(+) to A(+), B(-) to B(-) for communication.
Suggest to connect GND together when interference is very severe.
The RS485 interface support maximum 32 485 device, device. The cable maximum length is 1200
meters. Need to add 120Ohm terminal resistor for over 300 meters.

2.6. Mechanical Size

The dimensions of Elfin-EG4X are defined as following pictures(mm):
http://www.iotworkshop.com
Net Name Signal Type
RS485_B-
IO
VCC
Power
GND
Power
Net
O
Active
O
- 11 -
Notes
RS485 B-
9～18VDC
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.
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.