Hardware PropertiesInterfacing devices
Types of UARTs
Loop Back Plug
Q. In the manual you mention controlling the RTS and DTR lines but I am unable to figure it out. How do you accomplish it with your program?
There is a status indicator in the bottom right corner of the program
window. It shows status of RTS, DTR, CD , CTS, DSR and RI signals. Double
click on it to open a window with status of each signal.
Q. If I have something plugged into com 1 and want to trap it with your product, then your product cannot connect. If I unplug from com port then your program will connect to that port but now what I plug into that port cannot connect.
A. Look RS-232 has no functionality to intercept data from stream. It can send data to COM port any receive reply. If your program has already opened (initialized) the port, Look RS-232 will fail to do it and vice versa.
Q. I wrote a macro string, which I want to be terminated by the char "carriage return" (ASCII code 0dh). When I press the return button on the keyboard, the expected char will not be added to the macro string, but the macro will be finished. How can I add any ASCII code?
A. Look RS-232 can send data entered as symbols (CHAR) as well as entered as BIN, HEX, OCT and DEC. If your case, if you need to send "carriage return" (ASCII code 0d h), you need to enter h 0d. If you need to send text, enter it in quotation marks ("Hello Word" , h 0a 0d). See example.
Q. It seems that I cannot get more than 8 characters to display on a given line regardless of configuration. Can you suggest what I may be missing?
A. You can change width of info field from 4 to 32 characters. See screenshot.
When I connect a scope to the transmit line on my serial port, two stop
bits are sent no matter what setting I choose (1, 1.5, or 2). Is there
a way I can fix this?
A. According to specification stop bit with size 1.5 is used only for words of 5 bit length. If attempt to open port with incorrect settings is made, system error is displayed.
What does it mean when it says: "A line-status error occured"?
I think COM-port in PC and COM-port in external device were opened with different settings.
Q. One question? we were hoping to use Look232 to send a command to a display monitor to turn itself on at 7:00 AM and off at 7:00 PM. Is Look232 capable of such "scheduled" events? can you think of a solution to this issue?
A. Sorry, but current version of Look RS-232 cannot work in "scheduled" mode
Q. Yes, I want to use 16bit symbols. Could you please tell me how to use it?
Transfer of 2 bytes in used to send 16 bits. For instance if you need
to send code FF43 write the following in Data Send Task:
Q. I have to connect a clock which has rs 232 port from where it receive clock singnal i want to connect it to a computers rs232 port to receive real clock of the computer at perodical interval of time say after a minute since i am not a professinal i just want to now the commands in dos or windows hyperterminal.
A. LookRS232 cannot generate data automatically. LookRS232 can send data entered into Data Send Task area to your COM-port. Besides, LookRS232 cannot repeat commands in given time periods.
Q. I require to dump the macro and macro expansion data into a test procedure. How can I import the TSk file? Also I would like to generate may more TSK files for specific tests. How do I create a tsk file that Lookrs232 will read?
Q. So, if I 2 devices A & B and want to put my laptop between them I would run a null modem cable from device A to my laptop's com1 and then another null modem cable from my laptops com2 (if it had one) to device B? Does Look RS232 pass through the serial communication?
A. May be RS-232 Spy will suit in your case. RS-232 Spy controls all traffic going through your computer COM port. It shows all the traffic as memory dump and allows you to analyze data. Data can be highlighted (in full version) according to pre-set masks. Program is very easy to manage and use.
Q. Is your software able to perform BitErrorRate testing on an RS232 connection via computer. Without the need for a BER or BERT test set.
A. If bit rates of incoming and outgoing transfers are not the same, Look RS232 will display the following error message in LogView: "A line-status error occured".
Q. Always i recive A line-status error occurred
A. Check the port settings for connection with an outer device.
Q. My problem has been traced to the way HEX data is actually incoded by the ACSII format. Your program appears to compensate for this but my equipment expects two true HEX nibbles in each eight bit word. If I'am not mistaken ACSII appears to 0-9 in the first three bits half of a byte and when it reaches A to F it reduces all those bits to 0 and then places a one in the final bit posity of the first nibble and then starts using the other nibble in the Byte.
A. Our equipment expects HEX to be transmitted as two true numbers in one byte, and not two simulated hex numbers using two bytes. Thus the program you have appears to display ASCII incoded hex numbers, and not true HEX numbers transmitted over a serial port, EI two 4 digit HEX numbers in one byte. The byte count using ASCII encoded HEX numbers is reported as being doubled. This gave us some difficulty in detecting the problem we were facing.
I have to figure out a way to encode and decode two true HEX numbers
per byte in LabVIEW
Try to do the following:
Q. I'm sorry ,,, ur's program v.good. just i want to see if ur program read from fax modem or ethernet card. if u can help me to do that pleas do it, or tel me how i can do
A. Unfortunately our program works only with COM ports. If your fax modem can be connected to COM port, you need to know commands protocol to work with it.
Q. Trial expired and when i was using transmission speed 19200bps program hangs up after less than one minute working during receiving data
A. At continuous data transfer much time is wasted on sending and recieving and outputting data to the screen. If great amount of data is being processed the program might stop responding. The only things you can do is to wait when transfers are finished or stop the transfer and then view data.
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