Installation CEI-220/420/420A/520/520A/620/820 Discrete Outputs
CEI-100/CEI-200/CEI-x20 User’s Manual 40
The CEI-420 has eight single-ended, unipolar discrete inputs. The CEI-
420A has 16 single-ended, unipolar discrete inputs, eight of which share
the same lines as the eight discrete outputs. The CEI-520/520A/620 has up
to sixteen single-ended, unipolar discrete inputs. The CEI-820 has 16
single-ended, bi-directional, unipolar discretes. Since discretes on the
CEI-820 are bi-directional, they may be used as inputs or outputs. For
example, you may choose to use discretes 1-4 as inputs and 5-16 as
outputs. Only the first 8 discretes on the CEI-820 are available on the front
panel (P2) connector, while all 16 discretes are available on the mezzanine
(P14) connector. The discrete input specifications are shown in Table 36.
Table 36. Discrete Input Operating Modes Specifications
Approximately 3.3 V. Because of the 4.7K pull up resistor, the discrete will
switch high as long as the discrete input source does not source current near
the threshold voltage. This allows for compatibility with TTL type signals.
CEI-220/420/420A/520/520A/620/820 Discrete Outputs
Each of the CEI-220/420/420A/520/520A/620/820 discrete outputs have a
circuit as shown in Figure 21.
Figure 21. CEI-220/420/420A/520/520A/620/820 Discrete Outputs
Modify the discrete outputs on the CEI-220/420/420A/520/520A/620/820
by using the AR_SET_CONFIG API routine to write a value to their
control register. The format is shown in Table 36. Each discrete output
consists of Open Drain configured MOSFET switch (Drain connected to
DISOUTn) with the gate control by the Discrete Output Control Register.
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