Phrych at 12:45, 20 June 2019

2019-06-20T12:45:43Z

Phrych: Created page with "{{DISPLAYTITLE:function modbusReadCoil()}} Read value from single coil using modbus protocol. The call is asynchronous: the code execution proceeds immediately and when the re..."

2019-06-20T12:36:40Z

Created page with "{{DISPLAYTITLE:function modbusReadCoil()}} Read value from single coil using modbus protocol. The call is asynchronous: the code execution proceeds immediately and when the re..."

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

nil modbusReadCoil(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 all outputs from NETIO with IP 10.0.0.105 on port 505
local 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 coil addr %d failed with error %d: %s", data.address, data.result, data.errorInfo))
end
end

for i = 101,104 do
modbusReadCoil{deviceAddress='10.0.0.105', port=505, timeout=6, address=i, callback=modbusReadCallback}
end

=== Requirements ===
Netio FirmWare 3.3.0+

__NOTOC__

@@ Line 25: / Line 25: @@
 === Usage ===
   -- Read value of all outputs from NETIO with IP 10.0.0.105 on port 505
-  local function modbusReadCallback(data)
+  function modbusReadCallback(data)
     if data.result == 0 then
       log(string.format("modbus addr %d, got %s", data.address, tostring(data.value)))

Function modbusReadCoil() - Revision history

Phrych at 12:45, 20 June 2019

Phrych: Created page with "{{DISPLAYTITLE:function modbusReadCoil()}} Read value from single coil using modbus protocol. The call is asynchronous: the code execution proceeds immediately and when the re..."