B&B Electronics MESR900 Series - Fiber Models - Manual - Manual (Page 67)

8. Modbus Help VlinxMESR9xx Modbus Gateway
Page 63 Manual Documentation Number MESR9xx-2113m
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Slowing down the polling rate may be helpful if power cycling doesn’t cure the
problem.
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A common misperception is that every serial network must terminate with a resistor.
While this was true of early serial network configurations, it’s typically the wrong
answer – call our technical support and verify if you’re an exception, at 815.433.5100
option 3.
A sometimes difficult problem is difference in grounding voltage between various network
locations. Stray voltage from lightning or other sources may also find its way onto the network.
These conditions make isolation necessary in many settings.