Users Manual

TPM541 series
www.sercomm.com 6
Cat-M1/NB Module
4. Button/Jumper introduce
4.1. RECOVERY button :
This button is used to enter boot ROM mode for firmware upgrade and recovery system when
device cannot boot up by some reason.
Please visit Sercomm technical support website and issue a ticket when you have problem with
booting up your TPM541.
4.2. RESET button :
This button is connected to PMU_SHUTDOWN pin for initiating power cycle that resets the
device or shutdowns device. (For reset function, please pull low button at least 100ms)
4.3. WAKEUP Jumper :
This jumper is connected to PMU_WAKEUP ping and is used to wakeup TPM541 while device is
under power saving mode.
When there is no traffic, TPM541 will get into power saving mode immediately when remove the
jumper and TPM541 cannot receive and deal any commands from host. Please plugin the jumper
to wakeup module and send AT commands.
4.4. JP18 :
This jumper is usage to power by USB or DC(J1) when plugin. When user want to measure the
current consumption, please remove this jumper and connect to HV_BAT&GND pin header with
current meter for monitoring the current log of module.