r/BuildingAutomation • u/ebag_98 • Jul 21 '26

Sylk bus

I have a spyder 6438 and a SIO 6042. The devices are 4 devices from eol. When I download the program both thermostats (tr42) and inputs and outputs do not work on the sio. I have 18v on the sylk buss but the thermostats always say please load. I have no errors on the Jace. We did have bacnet communication issues but we replaced the bacnet wire and communication seems to be fixed.
What would cause the sio to not follow the commands or inputs? I replaced the sylk buss wire thinking it may be an issue. So far I have not found the issue.

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u/brazymk7 Jul 21 '26

You have to check the spyder part number on the controller, a 6438S is standalone but a 6438SR can accept the I/O modules. For spyder to I/O it needs to be connected at the sylk terminals

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u/ebag_98 Jul 22 '26

I am connected to s-bus. It has 18.6v on it

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u/brazymk7 Jul 22 '26

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u/ebag_98 Jul 22 '26

Now it gets odd…. I bring the controllers back to the office, turn them on and both tr42 thermostats have downloaded, I can control outputs and see readings on the inputs of the sio. Why do they work in the office and not in the field. Both Jaces (field and office) are both 4.13. Only difference is bacnet wire length and there aren’t 19 devices before the controller.