Hi-flying HF2111A Manuel - Page 9

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HF2111A GPRS DTU User Manual
Function
Button
Switch

2.3. RS232 Interface

Device serial port is male(needle), RS232 voltage level(can connect to PC directly), Pin Order is
cosistent with PC COM port. Use cross Cable connected with PC(2-3 cross, 7-8 cross, 5-5 direct), see
the following table for pin defination.
Pin Number
2
3
5
7
8

2.4. 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.

2.5. Mechanical Size

The dimensions of HF2111A are defined as following pictures(mm):
http://www.iotworkshop.com
Name
Active
Power
Reload
Protect
Figure 3.
RS232 Pin Defination(Male/Needle Type)
Name
RXD
TXD
GND
RTS
CTS
- 9 -
Description
UART Data Bi-Color LED
Blue On: UART data output
Green On: UART data input
3.3V Internal Power Supply LED
Long press 3 seconds down and loose to
restore parameters to factory setting
Parameter Protect (Function is Reserved)

RS232 Interface

Description
Receive Data
Send Data
GND
Request to Send
Clear to Send