User Manual

5. ELECTRICAL DESCRIPTION
26
LZ T 123 7605 P1C
5.2.1 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.
5.2.2 Serial Data
The Control Terminal 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).
5.2.3 Serial Data Signals - RD, TD
The default baud rate is 9.6kbps, however higher bit rates up to 230.4kbps
are supported and can be set by AT commands. At start-up the module
transmits and receives data at the default rate of 9.6kbps in either standard
AT mode or binary mode (the first received data - AT or binary format -
determines the operating mode).
Serial Data From GT47 (RD) Pin 2
RD is an output signal that the Control Terminal uses to send data to the
external application.
8 CTS O ±13.2V RS232 signal:
Clear to send V
out
≥ ±5V
9 4.8V O 0 to +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
out
≥ ±5V
11 IN-2 I -0.5 to 32V Digital input V
IH
> 3V, V
IL
< 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
IL
< 0.6V, V
IH
> 2.4V
14 GND I - Ground connection and return path for
the extended inputs/outputs
15 ANA_IN I -0.5 to 32V Analog input measurement range: 0 to
12.75V
Pin Control
Terminal
Signal
Dir Max.
Voltage
limits
Description