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Multidrop RS-485 on Graphics Client doesn't work

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KnowledgeBase

296 Posts

Posted - 26 Feb 2002 : 14:33:08

Q: RS-485 multidrop doesn't seem to work on my Graphics Client.

There can be several reasons for this.

You must set "RS485"=dword:1 in the [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial] registry key of the onboard registry file, ADSLOAD.REG.

Older Graphics Client boards require a different transceiver to work in multidrop configurations. Contact ADS if you have multidrop requirements. ADS WinCE builds 1.55 and later support RS-485 multidrop capabilities. All versions will work with RS-422.

jlynch

22 Posts

Posted - 12 Oct 2004 : 04:58:40

Hi,

I am using the graphics client plus RS485 port for a half-duplex multi-drop application (modbus).
I am running linux 2.4.19. What are the issues with the transceiver mentioned above?
The board revision I have is rev B (170110-8000B)

rwhaley

628 Posts

Posted - 12 Oct 2004 : 17:52:31

The issue raised about "older graphics client boards" refers only to the "Graphics Client" not the "Graphics Client Plus". The Graphics Client Plus hardware does not have this problem.

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