Aquametrix AM-TBR Turbidimeter User Manual - Manual (Page 34)

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A sample communication would look like this:
(Master computer requesting a report from address #1): 1 CRLF
(AM-TBR set to address #1 Response):001 0.0249 NTU
8.3.3. Modbus Communication
Modbus protocol communication is operational on all models. The Modbus information is
covered in a separate manual.
8.4. Flow Alarm (Catalog # 19945A)
The flow switch for the AM-TBR is a factory-installed option. This option indicates a “Low Flow”
condition by switching both relays to the fail state and setting the 4-20 mA signal to 2 mA. There
is also a screen indication of the low flow condition and a modbus register is set.
8.5. Flow Controller (Catalog # 19778)
The flow controller limits the flow, in high-pressure systems, to safe flow limits of less than 1
liter/minute.
8.6. Remote Panel Meter (Catalog # 19609)
The remote panel meter allows for remote indication of the NTU reading using the 4-20 mA loop.
No external power is required as the meter is run off of the 4-20 mA source.