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Once you have compiled this sample program and it is running, use F2 to set a breakpoint
on either of the following two statements in mainline for a given relay to verify the
relay connections:
printf("All Relays COM is connected to its NO contact\n");
or
printf("All Relays COM is connected to its NC contact\n");
Once you hit the breakpoint use an ohmmeter to verify that the contacts are connected,
the ohmmeter reading should be ~0 ? for contacts that are connected and high imped-
ance for the contacts that are not connected.
NOTE: When the relays are toggled, the LED for the given relay will also be toggled.
? RELAY_LOW_PWR.C —Demonstrates how to configure the relays to operate in the power-
save mode. A relay is first activated normally for 50 ms, and is then pulsed every millisec-
ond with a 50% duty-cycle square wave, which essentially cuts the power required to keep
the relay energized in half. Since the operation of a relay in the power-save mode will
reduce the relay-holding force, this mode is not recommended when the relay may be sub-
ject to shock and vibration.
The normal relay-activation current is ~80 mA, which is reduced to ~40 mA for a given
relay with the power-save mode.
Before you run this sample program, place an ammeter in series with the power-supply
GND lead going to the Relay Card to verify that current drawn by the relay is in fact
reduced in the power-save mode.
Now compile and run this program. Watch the ammeter and the Dynamic C STDIO
window to view the current readings for the various relay states.
? RELAY_SEQUENCE.C —Demonstrates how to activate the relays sequenually to keep the
peak power surges to a minimum while the relays are being activated.
Once you have compiled this sample program and it is running, select the set of relays to
activate in the Dynamic C STDIO window. Watch the relay LEDs to verify visually that
the relays are being sequenced.
User ’s Manual
111
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