B&B Electronics Zlinx 485 - Manual (Page 39)

Modbus Basics
Manual Documentation Number: Zlinx485m-1808
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Hints and Tips
A few simple suggestions that may assist you if your system is experiencing problems
include:
• Slowing down the polling rate may be helpful if power cycling doesn’t cure the
problem.
• 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.