Use one at your own risk. My preference is to spend a little more on a reputable model rather than spend time worring about whether my issue of the day is caused by my cheapie USB to serial converter. The D-Sub adapter is optional. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Click next a few more times. Accept the EULA. A really long while. For example: Putting the power supply on the left makes sense to me because I like to visualize the input to the power supply on the left and the output on the right, but whatever works for you.
For example, you could enter Enter Detailed contact information. Submit Quit. Fieldbus connection design depends on the fieldbus. Signal status display. Labeling areas. Power supply status display:. Box supply U S. Auxiliary voltage U P. Thanks, Nathan.
The module has an ordinary RS port that would work fine on a multidrop network that had "listen-only" devices like text marquees on it. What it won't do is attempt to ignore traffic that's "not addressed to it"; that's what protocols like Modbus are for. It's just that you seemed to be getting bad info about the ASC or getting in touch with folks who don't know the product. I know it very well and didn't want you or future readers of this thread to get mis-information.
Actually the problem grows. I cannot "node address" the RS devices, so i don't think they will work on RS in a "multidrop", they also will have to be point to point. Here are the manuals on the 2 RS devices. Yes, they are also available on RS, but customer is presently using the RS devices as it comes standard and the RS option is 3 months out.
A couple of vendor app programs that I have use 7 bit ASCII as well, and this aspect becomes an issue when Hyperterminal is used because Hyperterminal does not save the correct comm setup when 7 bit is used. When Hyperterminal is closed and re-opened with a saved setup, it won't communicate with a 7 bit ASCII device because it re-launches configured for 8 bit data words.
Mixing 7 bit and 8 bit words on the same serial line is not doable. I went back and re-read the part of your original post where you mentioned wanting to put all the devices onto a single RS line, so now your comments about multidrop and protocol mixing make more sense to me. I only read the booklets briefly, but I'll make some comments. It has an address, a length byte, a function code, and a bit CRC. It appears to work on a simple query-response basis.
But it's definitely not Modbus. It just blasts out a 9-byte status data string every 20 milliseconds, and accepts a 5-byte command packet. The packet has a fixed header byte that doubles as a length value, and uses a simple "add the bytes" checksum.
And Carriage Return or Line Feed values are not used to terminate the data frames.
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