are four possible connections to the LX711: Ground (GND), Common
(COM), Positive (POS), Negative (NEG). External devices can be connected
to these four nodes via the color coded Banana Jacks. Various subsets
of these nodes are also made available on the XLR-M and BNC connectors.
GND node is the Chassis/Frame/Earth ground. The COM node is the
floating/isolated common of the LX711 output circuitry. The POS
and NEG nodes are the signal output pair, with one-half the signal
amplitude appearing on each node relative to the common, and with
XLR-M connector provides connection to three nodes: GND(1), POS(2),
and NEG(3). The BNC connector provides connection to the two signal
nodes: POS(TIP) and NEG(SHD).
groups of 4-LED indicators provide status of the Output Mode and
four Output Modes are: Balanced, Unbalanced, Common Mode Input,
and Common Mode Output. The Unbalanced mode connects the NEG node
later two modes configure the output nodes in a special way to test
the common mode performance of other balanced input and output devices.
Common mode output tests are performed with a simple Y cable between
the LX711, LX721, and other device.
four Output Impedance selections are: 40 , 150, 600, or INF Ohms.
The Infinite impedance selection leaves the POS and NEG signal outputs
unconnected for open circuit testing without loading of other external