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Modbus RTU addressing - No Raspberry Pi
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<blockquote data-quote="andy@fm" data-source="post: 14" data-attributes="member: 19"><p>Set up is two four relay / 4 input V4.0 boards with no jumpers on the first board and the second board has the RS485 terminator and ID0 jumpers fitted.</p><p></p><p>I am using Qmodmaster to control the boards.</p><p></p><p>I am able to turn on and read the coil status from a single board, but when I attached the second board I get check sum errors and the relay on the second board mirrors the relay status of the first.</p><p></p><p>I also tried running Modpoll to scan. That also only sees one device and then gives "Illegal Data Address exception response!"</p><p></p><p>Is there anything else I need to configure ?</p></blockquote><p></p>
[QUOTE="andy@fm, post: 14, member: 19"] Set up is two four relay / 4 input V4.0 boards with no jumpers on the first board and the second board has the RS485 terminator and ID0 jumpers fitted. I am using Qmodmaster to control the boards. I am able to turn on and read the coil status from a single board, but when I attached the second board I get check sum errors and the relay on the second board mirrors the relay status of the first. I also tried running Modpoll to scan. That also only sees one device and then gives "Illegal Data Address exception response!" Is there anything else I need to configure ? [/QUOTE]
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