Figure 12: Serial Header
NOTE
This component is optional and must be custom ordered
2.6
General Purpose Outputs
A unique feature of the LK204-25-USB is the ability to control relays and other external devices using
a General Purpose Output, which can provide up to 20 mA of current and +5Vdc from the positive side of
the GPO. This is limited by a 240 ohm resistor which is located to the above right of the GPOs as pictured
below in
figure 13
. If the device, which is being driven by a GPO, requires a relatively high current (such as
a relay) and has an internal resistance of its own greater than 250 ohms, then the 240 ohm resistor may be
removed and replaced with a Jumper.
Matrix Orbital
LK204-25-USB
11
