LM5 RS485 check

[edgars]

here is the script for RS485 self-test with either OK or ERROR message in Alerts. 
Make sure to adjust port names accordingly (2nd, 3rd lines):

Code:

require('serial')

port1 = serial.open('/dev/RS485-1', { duplex = 'half' })
port2 = serial.open('/dev/RS485-2', { duplex = 'half' })

function test(p1, p2)
errors = 0

p1:flush()
p2:flush()

for i = 1, 100 do
p1:write('1234567890')
res = p2:read(10, 1)
if res and res == '1234567890' then
res = '+'
else
res = '-'
errors = errors + 1
if errors > 5 then
break
end
end

io.write(res)
io.flush()

if i % 50 == 0 then
print()
end
end
end

test(port2, port1)
test(port1, port2)

alert(errors > 0 and 'ERROR' or 'OK')