B&B Electronics MESR321_SL_ML - Manual - Manual (Page 55)

Modbus Help Vlinx MESR321 Modbus Gateway
53
MESR321-xx_R001_2113_m
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If the slave cannot respond appropriately for some other reason (e.g. it does not
recognize the function code), it will return a message containing an exception
response.
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.