5. ELECTRICAL DESCRIPTION
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LZ T 123 7 605 P1C
Alternative Configuration
It is possible to reconfigure one or more of the signals in this section (RTS,
CTS, DTR, DSR DCD and RI) to be used as digital inputs or outputs if the
full RS232 serial interface is not required. Configuration is achieved using
AT command (AT+E2IO) or via embedded application intrinsic functions,
please refer to Control Terminal-Radio Device signal cross reference table,
page 30.
To be reconfigured as a digital IO, each signal must retain the direction and
the logic voltage levels attributed to it when used as an RS232 signal. For
example DSR can only be reconfigured as a digital output with
V
out
≥
±5V
.
5.2.5 Extended I/O Signals
Please refer to Control Terminal-Radio Device signal cross reference table,
page 30, for more information on the relationship between signal names
and pin numbers of the Control Terminal and the embedded Radio Device
engine.
Digital Inputs
Pin 4 & 11
Digital inputs IN-2 and IN-3 are available on the HD15 connector via pins
11 and 4 respectively. The inputs are detected via signals IO4 and IO7 of
the embedded Radio Device engine.
Note!
As an alternative configuration signals IN-2 and IN-3 can be used to
support a second RS232 serial interface as RTS-2 and TD-2. Further
information is given below.
Analog Input
Pin 15
The signal ANA_IN can be used for measuring analog input values in the
range 0 to 12.75V. ADC2 of the embedded GR47 is used to detect
ANA_IN.
The resolution of the converter is 8 bit with an measurement accuracy of
about 3%.
The input impedance of the ANA_IN pin is 50 k
Ω
.
Digital Outputs
Pin 5 & 12
Digital outputs OUT-3 and OUT-4 are available on the HD15 connector
via pins 5 and 12 respectively. The outputs are controlled via signals IO8
and IO3 of the embedded Radio Device engine.
Signal OUT-4 on the HD15 connector is switched in parallel to signal
OUT-2 on the RJ12 connector. The individual output signals are
generated by two different low side switches inside the terminal driven
from the common control signal, IO3. All Control Terminal output signals