User manual
GTR64 http://www.matrix.es/GTR64
SERVICE Input Flash programming enable signal
The SERVICE input signal is for flash programming enable input. The SERVICE pin is driven active high
by the host application using either a logic control input or applying a dc voltage (common in legacy
applications) to begin a flash download. This pin should be pulled leave unconnected
during normal
use
4. OPERATION
4.1 Switching On the Modem
There are two ways to switch on the modem, once power is applied.
either assert TO_IN high for > 0.2s;
> 0.2s.
he modem is fully operational after 4 seconds. Logging onto a network may take longer than this and is
m on again after it has been switched off or reset, while power is still applied.
TR m cycled from low to high.
4.2 Switch e M
ee ways to switch off (power down) described below:
• either use co
• or assert HR_IN high for 1 - 2 seconds. A delay of up to 10s is experienced as the modem logs off the
etwork
or assert TO_IN low to high for 1 - 2 seconds.
ust be deactivated prior to switching off the modem to ensure the unit switches
ff correctly.
.3 Resetting the Modem
status of the software, may be applied to the modem as follows:
erating states.
hese states are described in following table.
•
• or activate the RS232 control line DTR, high for
T
outside the control of the modem.
The modem can be configured to start up at the time power is applied by permanently tying power
connector signals TO_IN (pin 4) and VCC (pin 1) together. In this case DTR must be used to switch the
mode
Note!
D
ust be
ing Off th odem
There are thr
the modem as
the AT+CFUN mmand;
n
•
Note!
The DTR line m
o
4
A full system reset, independent of the
• assert HR_IN high for > 3.5s.
4.4 Operating States/LED
The modem has a green LED, as depicted below, which is used to indicate various op
T
Signal Mode Value
Minimum input voltage 2.5 V
Active High
Maximum input voltage 12.0 V
SERVICE
Inactive Low Maximum input voltage 0.8 V
GTR64 Integrators Manual V.1.2 Pag. 23
Preliminary. Subject to change without prior notice