32 EC-11User’s Manual
03-32-00418-05 DALSA Corp.
Figure 6. EIA-644 Example
Unused EIA-644 Inputs and Outputs
Unused outputs should be left unconnected. This will reduce power dissipation within
the camera and reduce radiated emissions.
Unused inputs should also be left unconnected; EIA-644 chips have fail-safe features that
guarantee a known logic state (HIGH) in fault conditions (unconnected, shorted, or
unterminated). Do not connect cables to unused inputs. Cables can act as antennae and
cause erratic camera behavior.
Cable Lengths
Figure 7 shows a graph of ideal communication data rate vs. cable length for the EIA-644
standard.
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