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modbus

0.2.0
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Modbus library with TCP Master & Slave implementation.

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modbus scripts sample.exs
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scripts/sample.exs 

alias Modbus.Master

#start master TCP server

{:ok, pid} = Master.start_link([ip: {10,77,0,211}, port: 8899])

#force 0 to coil at slave 1 address 3000

:ok = Master.tcp(pid, {:fc, 1, 3000, 0}, 400)

#read 0 from coil at slave 1 address 3000

{:ok, [0]} = Master.tcp(pid, {:rc, 1, 3000, 1}, 400)

#force 10 to coils at slave 1 address 3000 to 3001

:ok = Master.tcp(pid, {:fc, 1, 3000, [1, 0]}, 400)

#read 10 from coils at slave 1 address 3000 to 3001

{:ok, [1, 0]} = Master.tcp(pid, {:rc, 1, 3000, 2}, 400)

#preset 55AA to holding register at slave 1 address 3300

:ok = Master.tcp(pid, {:phr, 1, 3300, 0x55AA}, 400)

#read 55AA from holding register at slave 1 address 3300 to 3301

{:ok, [0x55AA]} = Master.tcp(pid, {:rhr, 1, 3300, 1}, 400)