SATEL-TR4+
Integration Guide, Version 1.6
21
4.5
VCC_IO pin
VCC_IO pin determines the voltage level of UART signals and the voltage level of GPIO output
signals. VCC_IO level also determines GPIO LOW/HIGH levels on each GPIO and UART input
pins.
4.6
Service pin
The SERVICE pin is used to set the UART1 into a known state. Pulling this pin LOW will activate
the service mode and set the UART1 into 38400, 8, N, 1. This is intended for service access of
the module, to have a known serial port setting in order to provide easy access to module settings.
The pin does not affect any permanent settings, nor does it change the mode of the module. It is
recommended to pull high or pull up by resistor to VCC_IO to return serial port 1 into the
configured state. When service pin is LOW the SL Commands are temporary forced to be ON
4.7
Stat pin
The STAT-pin indicates the status of the device. It can be used to drive or sink a LED current using
a proper series resistor. STAT-pin drive or sink capability is +/-10mA at 3.3 V. It is recommended
to use VCC_IO for LED current.
Notice that if STAT-pin is used to sink LED current, LED behavior is opposite to driving scheme.
The behavior of the STAT pin is described down below.
Blink cycle
Mode
“1”
- statically
M
odule is operational “searching for a new frame”
“0” for the endurance of the
received frame.
“0” when module is receiving data from air interface.
In practical cases will toggle at the frequency of the data
packets on the air interface.
“0” statically
Module is in sleep1 mode
The pin is toggled in transmission
interval
Module is sending data Over the Air
Pin is toggled in 1 s interval
Module has the connection to Configuration Manager
program.
Pin is toggled in 500 ms interval
SL command mode set to OFF and SL commands enabled
using “+ + +”
sequence, section 7.2.
Pin is toggled in 250 ms interval
Module has detected a fault, fault codes can be read via
Configuration Manager program.
4.8
VCC pins
VCC pins are to feed operating voltage to the module. Limit for this voltage is mentioned in
chapter 2.2 DC electrical specifications. User must take into consideration surge current and
current consumption issues before using these pins. Also, the user must be aware for any voltage
drop on the feeding path.
