User's Manual

TRM-300 / Integration guide
F070033PT_5.1_en
Page 16 of 26
en
Check voltage level prior to applying power to the TRM-300. The specified voltage shall be that measured at
the point of connection of the power auxiliary cable to the TRM-300.
The operating voltage must not fall below the specification limit under any circumstances.
Take into consideration the current consumption when transmitting at full power.
The operating voltage must not rise above the specification limit under any circumstances.
In case of availability of a voltage supply which is different from the TRM-300 nominal voltage, a voltage
adapter is required.
PowerTrunk recommends its 12VDC Adapter accessory (if the TRM-300 is intended for operation from the
usual types of regulated lead-acid battery power source of vehicles) and its 100-240VAC Adapter accessory
(if the TRM-300 is intended for operation from the AC mains).
The ripple on the operating voltage must not exceed 80mV on the load.
9.3 DATA AND CONTROL INTERFACE
9.3.1 Serial Interface
A UART is available, which provides one asynchronous channel with handshaking capability (RTS, CTS,
DTR and DCD, in addition to TxD and RxD) and a maximum data rate of 115200 bits/sec.
It supports the industry standard RS232 connection, but an external level converter is required. It can also be
converted to USB through a bridge controller.
In both cases the external electronics must isolate the connection if the TRM-300 is switched off. For it, the
pin 9 signal can be used to control that external electronics. If a 47KΩ resistance is connected between the
pin 18 and ground, and afterwards the TRM-300 is switched on, then the pin 9 signal will be activated,
providing the TRM-300 supply voltage (7.4V nominal).
The usage of the port can be configured with the PowerTrunk Programming Kit (which includes the
T2PRO_Programming Guide).
9.3.2 Programmable Input/Output Interface
A digital input signal and a digital output signal are available for applications that require them.
The usage of this interface can be configured with the PowerTrunk Programming Kit.
The input signal can be configured to send a status message whenever it is active-high (3.3V) during an
established time. The application must generate the digital input signal voltage.
The output signal can be configured to be active-high (3.3V) during an established time whenever a certain
status message is received. It can also be inactive-low (0V) whenever other status message is received.
Pin 12
SIG_IN
Pin 13
SIG_OUT
Microprocessor
Unidirectional TVS
Maximum Reverse Working Voltage = 5V