Dear Mark, I'm so sorry for my stupidity. You were right: the Tag, which is used to display Baudrate, must be declare as INT32 cause faster baudrate (such as 38400, 115200) is larger than 32,767. But, I don't know why I couldn't communicate 2 devices using baudrate faster than 19200, eventhough my s...

At last, I can communicate with serial device smoothly without any errors. Every 500ms, HMI would send a packet (10bytes + CRLF) to serial device, and a packet contains command which tell serial device to send back the data. That's it! I think the trouble is there's no handshake between serial devic...

My HMI would send commands (up to 10 bytes - small packet!) to device and receive data (up to 10 bytes). But, in this test, my serial port just try to read data from serial device to HMI. I think it should be handle every 500ms... But it takes about 3-4 ticks, which means 1.5s-2s, I don't think this...

I did try reading buffer as your advice: private static void SerialPortScan(Object sender, EventArgs e) { _serialTimer.Enabled = false; //Read data from RXD buffer to _bufferReceive _bufferReceiveLength = _serialPort.BytesToRead; if (_bufferReceiveLength > 0) { if (_bufferReceiveLength < _serialPort...

Hi Ron and Mark, Thanks for your replies, I was so silly not to check whether Bytes To Read greater than 0 or not. If Bytes To Read = 0, Read methods would stand by and wait until there're some bytes in buffer... ReadExisting() would be great if my system communication using ASCII data format. Howev...

hi Mark, Thanks for your reply. I'm using a timer to read buffer of serial port, and using timer Tags to indicate timer interval each Timer event: private static void TimerProcessHandler(Object sender, EventArgs e) { timer.Enabled = false; if (Globals.Tags.timer.Value++ == 255) Globals.Tags.timer.Va...

Dear Ron, Thanks to your Serial Communication script, which was post in FAQs, I finally communicate HMI with another device using COM port. Sending bytes from HMI works flawless, but I encounter some problems when try to read data in serial buffer. I try using Read(byte[] byte, int index, int count)...

I guess I found another way to get Security Group: using Neo.ApplicationFramework.Tools.Security; and then call class SecurityGroup public SecurityGroup _securityGroup; Dear Ron, I was so silly, SecurityGroup and SecurityUser is just a class, I need to call an instance, which has the Group and User...

Dear Ron, Moreover, this is what made me confused: IList<ISecurityUser> HMIUsers = Globals.Security.Users; int userIndex = GetUserIndex(HMIUsers, userName); IList<ISecurityGroup> userGroups = HMIUsers[userIndex].SecurityGroups ; Actually, this security group pop up in my head in the first time, so ...

Dear Ron, Moreover, this is what made me confused: IList<ISecurityUser> HMIUsers = Globals.Security.Users; int userIndex = GetUserIndex(HMIUsers, userName); IList<ISecurityGroup> userGroups = HMIUsers[userIndex].SecurityGroups ; Actually, this security group pop up in my head in the first time, so I...