RS232 serial read

[Gadjoken]

Code:

if not port then
 require('serial')
 port = serial.open('/dev/RS232', { baudrate = 9600 })
 port:flush()
 line = ''
end

char = port:read(1, 1)
if char then
 if char == '\r' then
   line = line:trim()
   alert(line)
   line = ''
 else
   line = line .. char
 end
end

Hi Admin,
I have a question about RS232 i have try this profil with RS485 but i want (because i have many devices on RS485 and only this on Rs232) to put this device on RS232 with script but i don't now how make that : 

{
 "manufacturer": "TEST",
 "description": "TEST",
"mapping": [
{ "name": "1", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 0, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "2", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 0, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "3", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 1, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "4", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 1, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "5", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 2, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "6", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 2, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "7", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 3, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "8", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 3, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "9", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 4, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "10", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 4, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "11", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 5, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "12", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 5, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "13", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 6, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "14", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 6, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "15", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 7, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "16", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 7, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "17", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 8, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "18", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 8, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "19", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 9, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "20", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 9, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "21", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 10, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "22" "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 10, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "23", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 11, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "24", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 11, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "25", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 12, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "26", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 12, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "27", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 13, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "28", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 660, "value_bitmask": 0x00FF, "writable": 0},
{ "name": "29", "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 660, "value_bitmask": 0xFF00, "writable": 0},
{ "name": "30" "bus_datatype": "07", "type": "register", "datatype":"uint16", "address": 668, "value_bitmask": 0x00FF, "writable": 0}
 ]
}

Thanks a lot.