User`s guide
Verify Communication Settings
The Serial MODBUS supports 2 transmission modes: RTU
and ASCII. The default communication is MODBUS-RTU, 8
data bits, No Parity, 1 Stop bit (8-N-1), 19200 baud. The MOD-
BUS slave ID or Modbus address is 99 or 0x63.
The following commands (Function Codes) are supported:
• FC = 1: Read Coils
• FC = 5: Write Single Coil
• FC = 15: Write Multiple Coils
• FC = 3: Read Holding Registers
• FC = 6: Write Single Register
• FC = 16: Write Multiple Registers
All other commands, exceptions, or other interface features
are not supported.
Perform Communication Verication
Poll the WACTIVE gateway coil at address 1. This should
return False if no sensors have been registered yet.
Poll the Gateway ID registers 40002-40003 and verify the
number returned matches the Gateway ID on the bottom of
your serial MODBUS gateway (4 digit number near the bar
code).
If the device times-out or gives some other error, please see
the Monnit Serial MODBUS Gateway User’s Manual for ex-
ample MODBUS communications.
Change Communication Settings
If you prefer to use different communication settings than the
default, follow the instructions on the next page. Otherwise,
skip to the next section.
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