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5.5.3 Relay Card Function Calls
CAUTION: Activating several relays in a short period of time may cause a power
surge that may exceed the peak power rating of your power supply. It is ultimately the
responsibility of the application designer to ensure that the power supply meets the
requirements for the intended application.
Also note that the power-save mode will reduce the holding force for the relay con-
tacts. Rabbit Semiconductor recommends that you not use the power-save mode when
the Relay Card is expected to be subject to shock and vibration.
int rn_Relay(int handle, int relay, int value,
int reserved);
Sets the state of a given relay by connecting the relay common contact to either the relay normally closed
contact or to the relay normally open contact.
PARAMETERS
handle is an address index to device information. Use rn_device() or rn_find() to estab-
lish the handle.
relay is the selected relay (0–5).
value is used to set a given relay connection as follows:
0 = common connected to normally closed contact
1 = common connected to normally open contact
reserved is reserved for future use. Set to 0.
RETURN VALUE
The status byte from the previous command. -1 means that device information indicates the Relay Card
is not connected to the master.
SEE ALSO
rnRelayAll, rnRelayPwr
112
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