Phrych: Created page with "{{DISPLAYTITLE:function modbusReadDiscreteInput()}} Read value from discrete input using modbus protocol. The call is asynchronous: the code execution proceeds immediately and..."

2019-06-20T12:45:18Z

Created page with "{{DISPLAYTITLE:function modbusReadDiscreteInput()}} Read value from discrete input using modbus protocol. The call is asynchronous: the code execution proceeds immediately and..."

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{{DISPLAYTITLE:function modbusReadDiscreteInput()}}
Read value from discrete input using modbus protocol. The call is asynchronous: the code execution proceeds immediately and when the response arrives, callback function is called.

nil modbusReadDiscreteInput(table <code>config</code>)

=== Parameters ===
table config{<code>deviceAddress</code>, <code>callback</code>, <code>address</code>,<code style="color: #777">port</code>, <code style="color: #777">timeout</code>}
* string <code>deviceAddress</code> IP address of device
* function{response} <code>callback</code> this function is called when response arrives
* string <code>address</code> number of the coil
* optional number <code>port</code> numer of port (default 502)
* optional number <code>timeout</code> maximum seconds to wait for response (default 30)

=== Callback Parameters ===
table response{<code>result</code>, <code>errInfo</code>, <code>address</code>, <code>value</code>}
* number <code>result</code> error code of the response (0 is success)
* string <code>errInfo</code> error description (if result>0)
* number <code>address</code> number of the coil
* boolean <code>value</code> value of the coil

=== Return value ===
nil

=== Usage ===
-- Read value of discrete input on IP address 10.0.0.105, on port 505 with address 102
function modbusReadCallback(data)
if data.result == 0 then
log(string.format("modbus addr %d, got %s", data.address, tostring(data.value)))
else
log(string.format("modbus addr %d failed with error %d: %s", data.address, data.result, data.errorInfo))
end
end

modbusReadCoil{deviceAddress='10.0.0.105', port=505, timeout=6, address=102, callback=modbusReadCallback}

=== Requirements ===
Netio FirmWare 3.3.0+

__NOTOC__

Function modbusReadDiscreteInput() - Revision history

Phrych: Created page with "{{DISPLAYTITLE:function modbusReadDiscreteInput()}} Read value from discrete input using modbus protocol. The call is asynchronous: the code execution proceeds immediately and..."