The examples will cover some of application scenarios. Its IO access is dealing with digital input/output, analog input, RS485 bus access. Its networking ability will cover modbus networking and USB connection with PC application. All the access can happen concurrently. The data processing capbility can take the advantage of powerful C language. So this device is a PLC with special data processing capability and it has no operating system demand at user application level. The examples includes very classic blink demo and also advanced supervisory control system.

All the application source code is only contained in one file. All the development tool chain is contained in a tiny GUI utility.

Example	Description	Settings	Comment	Download
blink	turn on and off 8 output channels repeatedly with related channel indicators blinking	not required	输出通道断开闭合及对应指示灯闪烁的经典例子	blink.zip
hello	send a line of message from one of RS485 ports periodically	set baudrate and communication mode the same to the connected terminal	a usb to RS485 cable is required to connect from PC USB to egPLC5888 RS485. 状态图编程经典例子	hello.zip
test	test RS485 commnication channels and digital output Yout. The com0-AB and com1-AB wires should be connected before testing	For egPLC5888xp, the slave address is set to 21 (hex form), the baudrate and communication mode to be set properly. For egPLC5888zp, settings are not required	testing programs are carefully chosen according to board variants	test_xp9600_8N2_21.zip test_zp115200_8N1.zip
printf	output integer, char, string variable to RS485	the baudrate and communication mode to be set properly to match display terminal end	演示C语言性能	printf.zip
modbusRTU	this program show to use egPLC5888 com1 to get temperature and humidity from modbusRTU interfaced sensor	baud rate of the sensor is set to 9600. communication mode is 8-bit data, none paraity bit, and 1 stop bit	the sensor data can be accessed and viewed using egT.exe utility. 通讯设置值为9600，8-N-1. to use egT.exe to view internal register, one needs a USB connection, then issue command: connect input 0x0000 input 0x0004	modbusRTU.zip
DLT645	one of electricity meters records live power current and voltage. Its RS485 interface uses DLT645 protocol. egPLC5888 can code this protocol and get data from the meter	baud rate 2400, 8-bit data, even parity, 1 stop bit	it can read electricity AC voltage, current, and power, and many other more. can form a network with multiple meters	DLT645.zip
analog	read analog sensor voltage signal (range from 0v to 5v) and convert to float point numbers. the sensor has 8 channels, temperature, humidity, dust, O2, SF6, and 3 PT100 channels	not required	application-level low-pass digital filters can be further applied to analog channels. 0-20mA cuurent signals can also be inputted to egPLC5888	analog.zip
Xin	read 8 digital channel signals. The digital signal for input should be circuited in series with DC power supply	not required	the DC power supply should be chosen between 5VDC and 24VDC	Xin.zip
Yout	output 8 channel digital signals to control input of next stage, eg. relay input coils	not required	the separate DC power supply is required to form a control loop, IO statement is same to blink	blink.zip
inverter	example to use RS485 to do actuation. the connected device is a kind of inverters, which output 3-phase current to drive a fan	programmatically set the communication parameters and keep in consistency each other	other RS485 interfaces actuators can be equally connected on the same bus	inverter.zip
masterslave	1 egPLC5888zp + n egPLC5888xp networking example to extend IO space and build a distributed system	all egPLC5888 ports on the same RS485 bus should use the same baud rate and communication mode	可扩展IO空间和构建分布系统	masterslave.zip
pclink	connect egPLC5888 with PC through USB or RS485 slave port. PC application may also access to multiple egPLC5888 through USB hub through .Net API	baud rate and communication mode should be in consistency	by egPLC5888 IO access capability PC can be used to construct non-statndard testing and other mechanical equipments	pclink.zip
upsdaq	advanced application to monitor and display the status of air-conditioned cabinet. acquired data including air-con status, smoking detector, HMI LCD, ups voltage/current status are displayed and linked to remote server through RS485-Ethernet module	egPLC5888zp, downlink port com0: 9600 8-N-1 uplink port com1: 115200 8-N-2	downlink port is conneted to UPS, HMI LCD; uplink port is connected to RS485-Ethernet Module. temperature and humidity sensors connected to analog channels, air-con stutus and smoke detector connected to digital channels. No actuation is required	upsdaq.zip upsdaq_readme.jpg

To connect egPLC5888 to human machine interface(HMI) is through RS485. Also the PC application can also access this device through USB port, which PC application can access the device communication registers or other IO space by egInput/egOutput API. For those applications applied to industrial control area RS485 is commonly used to connect touch screen on the scene. Both slave port and master port of egPLC5888 can be used for this purpose, however, related code is somewhat different.

For slave port
The egPLC5888xp connect com0 to other initiative port, and there is no code is required for egPLC5888xp for this comminication. for the modbusRTU protocol has been built-in the users can directly access all IO space registers after setting the communication parameters properly.

For master port
A polling method is used for egPLC5888 master port to communicate with touch screen. In this case HMI end is set to slave mode. The memory registers (or IO channel registers) on the HMI device end is configured for being read and written. The configuration of the commnication areas are according to HMI device features and this is users design to do data exchange on both programmable devices to carry out their subsystems working together peacefully and harmonically. The "upsdaq" is the example to use egPLC5888 master port to talk to LiteOn HMI slave port.