cabletest

local side = "back"
local modem = "top"
local c = 0
local colortable =
{
    ["white"] = { colors.white, false },
    ["orange"] = { colors.orange, false },
    ["magenta"] = { colors.magenta, false },
    ["lightBlue"] = { colors.lightBlue, false },
    ["yellow"] = { colors.yellow, false },
    ["lime"] = { colors.lime, false },
    ["pink"] = { colors.pink, false },
    ["gray"] = { colors.gray, false },
    ["lightGray"] = { colors.lightGray, false },
    ["cyan"] = { colors.cyan, false },
    ["purple"] = { colors.purple, false },
    ["blue"] = { colors.blue, false },
    ["brown"] = { colors.brown, false },
    ["green"] = { colors.green, false },
    ["red"] = { colors.red, false },
    ["black"] = { colors.black, false }
}

-- Check and save active outputs
function check()
    for k,v in pairs( colortable ) do
        result = redstone.testBundledInput(side, v[ 1 ])
        v[ 2 ] = result
    end
end

-- Set new output
function set()
    for k,v in pairs( colortable ) do
         if v[ 2 ] == true then
            c = c + v[ 1 ]
        end
    end
    redstone.setBundledOutput(side, c)
end

check()

while true do
id, cmd = rednet.receive()
    if cmd == "on" then
        redstone.setBundledOutput("back", colors.white)
        check()
        set()
    elseif cmd == "off" then
       redstone.setBundledOutput("back", 0)
    end
    sleep(0.75)
end