Digicom pocket GSM User Manual page 53

PocketGSM
Connection Examples
If you want to manage a simple led (1,5V – 20mA), with a 12V
power supply, you must add a pull-up resistor (470Ω) to limit
the current.
If you want to manage a lamp with 230V
power supply, you can connect an external
rele and a diode (1N4007 or 1N4148) to
protect the transistor inside the PocketGSM
Note: if you use a cable to connect the rele,
connect the diode close to the pin1 or pin2 of
the PocketGSM to protect the transistor inside
the PocketGSM.
4.33
AT Commands