Serial Port in VB .NET 2008

[mustipusti]

Originally Posted by calvinpower

its grateful that u have provided me with such a beatiful and simple tutorial. i was in search of such tutorial for long a time.
I have managed to add a progressivebar and a timer. I am about to start prepairing gsm AT commands like read imei, firmware version, model , make and so forth. please guide me how to send all AT commands at once. and please can you give me AT commands for " read security code, write flash etc...etc..

hehe there are no at commands for write flash / read security code

[calvinpower]

can this (JAU Delphi Sources) be converted to vb ? or c++

[adityajha]

HOW to get device id in VB 2008,bcz in this code only available com port is showing but my question is how i get dtail of attached device or how to filter proper device by serial port in vb 2008.

[Dave.W]

Originally Posted by adityajha

how to filter proper device by serial port in vb 2008.

- Get list of all ports
- Send a command with known response to each port in turn
- Monitor response.

For example send AT command "AT?" to each port. If Returned data is "ATOK" then you know is connected an AT compatible device. If not then try next port.

Now you can check identity of connected device.

Good luck.

[adityajha]

Originally Posted by Dave.W

- Get list of all ports
- Send a command with known response to each port in turn
- Monitor response.

For example send AT command "AT?" to each port. If Returned data is "ATOK" then you know is connected an AT compatible device. If not then try next port.

Now you can check identity of connected device.

Good luck.

thanks 4 ur reply i kno what u r saying but i want proper device name in combo box.we r using AT for check which port is connected ,but i want list of all connected device .

New Microsoft Word Document.doc

can u got my topic and give me pfoper command for that.

[Dave.W]

There is no such thing like that using serial ports. You must study how to use USB. You can find source by fr3nsis in the fourm, it will help you.

Good luck.

[hiramlight]

Hello,

I know it has being a long time since this post was created, but I am trying to communicate with an Encoder using Silicom Lab CP210X USB/UART bridge , at first I use a RS 232 class , couldn't get any reply from the encoder ( The hardware is good as the hotel is using it during the day with the C++ application who come with it) , then I tried AnySerialPOrt , a very nice C# app written by Orhan who let you build driver for serial port, still no reply, the format in which the string has to be sent is at follow.

The EIA RS232C standard interface is employed to connect ADEL interface network system with the hotel management system.
3.1.2 Data Format

Data format: 1 start bit, 1 end bit, 8 data bits, no verification; The communication rate is from 2400bps to 19200bps.
3.2 Data Protocol

3.2.1 Control Character

STX (0x02):Tag the beginning of the data.
ETX (0x03): Tag the end of the data.
ENQ (0x05): Test the connection.
ACK (0x06): Response to the end which transmits the data and show that the transmitted data is correct.
NAK (0x15): Response to the end which transmits the data and show that the transmitted data is wrong.
RS (0x1E): Tag the beginning of the new field (region) and is followed by the field identification code.
3.2.2 Information Format

Information format: <STX>ddssff[data]<ETX>cc
When the receiving end gets the information complying with the above format, it will respond with “ACK” if the calculated verification is same as the received verification. Otherwise, it will respond with “NAK”. The above responses (ACK and NAK) are applied to check the data integrality. They show neither the data content nor whether the execution result is right or wrong.

Information Field
Description
dd
Destination address, target (client) address
ss
Source address which tags the information source
ff
Command or answer code
[data]
Data region (optional)
Destination address:
2-byte; virtual value: 00 to 99. Receive the information destination address or designate the client end to execute the commands.
Source address:
2-byte; virtual value: 00 to 99 (00 is reserved by the system). Tag the information source.
Command code:
1 byte ASCII code. Specify the command to be executed.

Check character:
2-byte;
Algorithm: Use 0x00 as the seed to do XOR with all the data after STX. The result of each XOR will be used as the new seed for the next XOR. The final 1-byte result will be transformed into a 2-byte hexadecimal ASCII code.
Example:
STX
0x30
0x39
0x52
ETX
C1
C2

First calculation: 0x00 XOR 0x30 = 0x30
Second calculation: 0x30 XOR 0x39 = 0x09
Third calculation: 0x09 XOR 0x52 = 0x5B
Forth calculation: 0x5B XOR 0x03 = 0x58
Verification code of the first byte (C1): 0x5 ->ASCII 5 = 0x35
Verification code of the second byte (C2): 0x8 ->ASCII 8 = 0x38

/////////////////////////////////

I build the HEX convert module to XOR the data, when I send a string like <STX>0103E<ETX>CC, I expect a ACK or NAVK back if my dta is incorrect , but herre nothing, just:
=======================
<20110403184211.296 SYS>
Set timeouts: ReadInterval=100, ReadTotalTimeoutMultiplier=2000, ReadTotalTimeoutConstant=2000, WriteTotalTimeoutMultiplier=0, WriteTotalTimeoutConstant=0
<20110403184251.335 SYS>
Purge the serial port: RXCLEAR, TXCLEAR
<20110403184257.523 TX>
<STX>0103E<ETX>44
<20110403184439.616 SYS>
COM port is closed
======================

when checking with a serial monitor the data TX and TX to the enocder from the C encoder software I get those stange ASCSII char :

===================
000043: I/O Request (UP), 29.03.2011 16:47:51.090 +0.0
IOCTL_SERIAL_PURGE: Purge requests
000044: Write Request (DOWN), 29.03.2011 16:47:51.090 +0.0
Buffer size: 0x16 bytes
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 7E ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ~
FF 00 DF 0B 17 7E ÿ.ß..~
000049: Read Request (UP), 29.03.2011 16:47:51.121 +0.0
Buffer size: 0x1 bytes
Status: 0x00000000
7E
...ETC>>>>>>>>>>>>>
==================

I think this is coming from the silicom Lab bridge ...

I would appreciate any ideas or suggestion or if anyone has worked with Silicom lab bridge before ..
Cheer's

Alan

[raghavroy]

problem in activating com port through usb to com port converter can u pls guide anyone

[::gsmcoder::]

waooooooooooooooo i have modified the string to send fbus commands, perfect, thanks dev, my programming skills are advancing

[::gsmcoder::]

Originally Posted by calvinpower

can this (JAU Delphi Sources) be converted to vb ? or c++

working perfect in vb, tested by me

[adeel ur rehman]

how to read data from serial port:
sir i have a problem in receiving data through serial port . i have project in i have to receive
voltage value through serial port please help me and send coding in vb.net
Thanks in advance...............

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[Spoochy]

Wake up Dave. Two spammers needed to be killed.

[Darkensser]

Wwwaaoo nice post... Thanks!!! VB.NET ADVANCED!