Connector Bridge RS485 Interface

[admin]

Use this script to send a command and receive a reply from the bridge. Make sure that only a single script instance is running at any time. Serial port cannot be shared between multiple concurrent scripts.

Code:

require('serial')

port = serial.open('/dev/RS485-1', { baudrate = 9600 })

function readreply()
  local line = {}

  while true do
    local char, err = port:read(1, 5)

    if char == nil then
      return nil, err
    elseif char == ';' then
      break
    else
      line[ #line + 1 ] = char
    end
  end

  return table.concat(line)
end

command = '!000V?;'
port:write(command)

res, err = readreply()
log(res, err)