supervision of an instrument that communicates through rs 232 protocol
I have to do:
1) be listening on port to capture on my pc the prints that the instrument automatically sends to network printer
2) read or write values by sending a query and receiving a response. That is worth in a protocol that I have, I also know the number of characters response and other values to interpret the first timeout the answer.
I need to know how to set the values of control mscomm.ocx.
You have some examples about?
Good Answers (1)
Francesco Maria R
Owner, FMR9000 s.r.l. Information Technology and Services Consultant
Best Answers in: Computer Networking (1), Telecommunications (1)
Hi all,
ATTENTION, mscomm.ocx works well, for RS232 devices, only when the port is a on board port, on USB converter there are some problems dues to USB buffering. Thus if the protocol has a character termination for PC input USB converter could work.
This problem is manifest on RS232 connections to PLC, EEPROM writer and so on. Before write a program is needed to examine the protocol.
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Bryan C W
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Check with National Instruments. Their LabVIEW or LabWindows products can help and they may have drivers for your instrument.
Links:
James Brian P
Network Engineer at SAIC
Best Answers in: Computer Networking (1), Software Development (1)
First you will need to know the speed of the connection...I.E. 9600 bps
8 none and 1 or 19200 bps.
I would experiment with a hyperterminal first and see what the instrument sends at what speed and what the flow control needs to be set for...
I found an excellent web resource that may also help you in regards to setting up the mscomm.ocx.
http://bytes.com/forum/thread13252.html
Links:
Hi Roberto,
It looks quite similar to one of application that my team and I developed almost 4 years back, with a purpose to capture billing call details from PBX switch through a RS-232 port.
We had used Microsft Visal Foxpor/Basic communication activex control "MSCoMM" for all the interfacing with the device through a serial port. You may further read about it at
Links:
Try to dig in the MSDN samles. It was perfect samle on the Developer Studio 5 and 6 CD. As far as I remember I relocate from API to mscomm.ocx for a couple days.
