Data Sheet

Relay interface

The NO, NC, and COM pins are connected directly to the relay.

• NO stands for “normally open”. This pin is normally disconnected from the COM pin, but they

become connected when the relay is active.

• NC stands for “normally connected”. The NC pin is normally connected to the COM pin

through the relay, but they become disconnected when the relay is active.

• COM stands for “common”.

These pins are electrically isolated from the logic side of the board and are routed on the PCB with

a minimum clearance of 60 mils (1.5 mm) from other copper and from the board edges, though

manufacturing variations in the board edges can make those distances slightly lower.

In most applications, the current and voltage ratings for the module will match the ratings of the

relay used. Maximum current, maximum voltage, and life expectancy are interdependent; we therefore

recommend careful examination of your relay’s datasheet. If you are using the included relay, please

refer to the Omron G5LE-14-DC5 datasheet [https://www.pololu.com/file/download/G5LE.pdf?file_id=0J619]

(1MB pdf) for information.

Warning: The RC Switch with Relay is not designed to or certified for any particular high-

voltage safety standard. Working with voltages above 30 V can be extremely dangerous and

should only be attempted by qualified individuals with appropriate equipment and protective

gear.

Outputs and indicator LED

The RC switch provides feedback about what state it is in via a yellow indicator LED. The LED

behavior is described in Section 8. Status information is also provided by two additional outputs:

• The GOOD pin indicates the presence of a valid RC signal (10–330 Hz pulse rate,

0.5–2.5 ms pulse width).

• The OUT pin indicates whether the relay is activated (i.e. the relay coil is energized).

When high, the GOOD and OUT outputs will output a voltage approximately equal to 5 V or VRC,

whichever is lower. When low, these outputs will be at 0 V (ground). These outputs have 220 Ohm

resistors in series with them to protect them from short circuits.

5. RC Switch with Relay Page 26 of 45