Technical Manual

3. ELECTRICAL DESCRIPTION
17
LZT 123 7607 R1B
3.2.1 Standard RS232 Serial interface and Signals
The module supports a standard RS232 serial interface (EIA/TIA 574) via
its 15 pin high density connector, shown above.
3.2.2 Serial Data
The GT47 supports the standard data character format of 1 start bit, 8 bit
data, no parity plus 1 stop bit, in total 10 bits per character. In line with
serial communication terminology the module is the data circuit-
terminating equipment (DCE) and the external application or computer is
the data terminating equipment (DTE).
3.2.3 Serial Data Signals - RD, TD
The default baud rate is 9.6 kbps, however higher bit rates up to 230.4 kbps
are supported and can be set by AT commands. At start-up the module
transmits and receives data at the default rate of 9.6 kbps in either standard
AT mode or binary mode (the first received data - AT or binary format -
determines the operating mode).
6HULDO'DWD)URP*75' 3LQ
RD is an output signal that the GT47 uses to send data to the external
application.
6HULDO'DWD7R*77' 3LQ
TD is an input signal, used by the external application to send data to the
GT47.
9 4.8V O 0 - +4.8V,
75mA
Voltage supply for external devices
Supply voltage +4.8V, max. current 75mA
10 RI O ±13.2V RS232 signal:
Ring indicator V
RXW
≥ ±5V
11 IN-2 I -0.5 - 32V Digital input V
,+
> 3V, V
,/
< 2.8V
PullDown with 40KΩ
12 OUT-4 O 32V, 0.25A low side switch, short circuit protected
13 DTR I ±25V RS232 signal:
Data Terminal Ready V
,/
< 0.6V, V
,+
> 2.4V
14 GND I - Ground connection and return path for
the extended inputs/outputs
15 ANA_IN I -0.5 - 32V Analog input measurement range: 0 -
12.75V
Pin GT47
Signal
Dir Max.
Voltage
limits
Description