Control BenQ projector with RS232

[benanderson_475]

Hi 

I have some trouble to send control commands ON/OFF to a BenQ MS517H usin gfollowing event based script. 

Code:

require('serial')

device = '/dev/ttyUSB0'

port = serial.open(device, { baudrate = 9600, parity = 'none', stopbits = 1  })

-- get value of KNX object
value = event.getvalue()

if (value == true) then
  -- send power on command with returns to make them stick
  char = "<CR>*pow=on#<CR>" 
  port:write(char)
else
  -- send power off command
  char = "<CR>*pow=off#<CR>" 
  port:write(char)
end


-- close port
port:close()

I had an issue with benq once before, I think the solution was to replace <CR> with hex terminator 0D
Try,
char = string.char(“0x0D”)..”*pow=off”..string.char(“0x0D”)

Can you test the command by sending it from a terminal from pc