SENA HD1300 - Manual (Page 33)

Starter Kit and User Manual for the HelloDevice 1300
33
6.1.2 RS485 communication
Only 2 pins of RS485+ and RS485- are used in RS485 communication of the HelloDevice. You have to make
RS485 communication cable by using the connection shown in Figure 6.4.
RS485+
RS485-
RTS
CTS RS485+
RS485-
HelloDevice User device
1=RS485+
4=RS485
HelloDevice serial port
Figure 6.4 RS485 communication cable connection diagram
6.2 Sample programs
The Internet socket interface should be implemented either by socket application or by Java applet. The stream’s
target TCP port of the HelloDevice is 6001. Then, the HelloDevice will just pass the data to user device by serial
protocol.
6.2.1 Implementing Socket program
The following C program source code shows how to implement Internet socket interface program for the
HelloDevice communication. This sample code is implemented to send ASCII string data to the HelloDevice, by
using Berkeley socket C API functions. This source is a part of the entire source code “the HelloDevice
installation folder\Src\SerialDemo\C\serialdemo.c”.