Rack Bus

Overview

The Rack Bus section in the cee API provides functions for inspecting rack-mounted computer module power supplies and bus states in a ComputerCraft/CC:Tweaked environment.

This section is essential for developers working on rack systems, module power monitoring, and checking whether modules are running off the rack bus rather than individual feeds. The functions provided allow for fine-grained control over how programs query the rack's electrical environment.

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Calling Conventions / Prefixes

All methods within the Rack Bus section are accessed through the global cee namespace, meaning they can be invoked directly as:

local bus = cee.busInfo()
local powered = cee.isBusPowered()

These functions do not require any object instantiation and operate on the current rack bus state. They should not be confused with methods that are part of other sections like speaker or monitor, which may have their own peripheral handles.

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API Reference Table

Signature	Arguments & Types	Description
cee.busInfo()	None	Returns this rack's supply bus, or nil.
cee.isBusPowered()	None	Returns whether it is running off the bus, not own feeds.

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Lua Code Examples

Example 1: Checking Rack Bus Information

local bus = cee.busInfo()
if bus then
    print("Rack bus supply is active.")
else
    print("No supply bus found for this rack.")
end

Example 2: Checking if Running on Bus Power

if cee.isBusPowered() then
    print("Computer is running off the rack supply bus.")
else
    print("Computer is running off its own independent feed.")
end

Example 3: Monitoring Bus Power Status in a Loop

while true do
    local onBus = cee.isBusPowered()
    local busInfo = cee.busInfo()

    print("Bus Powered:", onBus)
    os.sleep(1)
end

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Notes

• cee.busInfo() answers questions about the rack's supply bus directly from a computer module in the rack, with no cable to a supply required.
• cee.isBusPowered() indicates whether the module is drawing power from the shared rack bus rather than its own dedicated feed.