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EXC/RTX19 - USER & MAINTENANCE MANUAL - rev.1.5 - 05/16
Page 12
REMOTE CONTROL FUNCTIONS
Both the Stl transmitter and receiver are completely presettable and controllable by the front
panel keyboard and display. The same functions are remotely possible through the serial RS232
port, which is located on the rear of each equipment. To control the equipment is anyway
required some purposely developed software which is not available at the present as a standard
option. Some simple demonstration program may be given only as a start point to development.
In addition to the serial port, a parallel one is provided on the rear, on which are wired some
signal and control wires. Both the 2 ports are described in the following paragraphs.
RS232 port
The RS232 port manages only Tx, Rx and Return data signals, with no handshake. Being the two
former signals inverted wired to the port, it needs a simple straight wired serial cable with
appropriate connectors to connect to a PC. Usually a female DB9 or DB25 female goes to the PC
port and a male DB9 connector at the transmitter end. Appropriate software is needed for
communication: simple tests may be performed with standard Windows "Hyperterminal". Do not
connect the cable with either transmitter or PC on.
Parallel remote control port
This port accommodates some lines for simple direct control / monitor on a DB9 male connector.
Many lines may be optionally assigned to differnt functions and logic polarity may be reseversed
from a dedicate setup menu. Default assignation is:
TRANSMITTER:
-
Pins 1, 5, 8
Ground
.
-
Pin 2,
On The Air
output. Open collector transistor circuit with a resistive pull-up: a +12V/
10k
Ω
signals that the transmitter delivers substantial RF power. It is not granted that the
output power is exactly as preset.
-
Pin 3,
Direct power
output. A signal proportional to direct power is present, with a pseudo
square law. Range is 0-5Vdc / 1k
Ω
impedance. Full power voltage usually ranges 3,5 to 4 V.
-
Pin 6,
RF enable
input. Base input of a common emitter transistor with a resistive pull-up.
A shorted circuit to ground disables RF. Maximum voltage and current available are roughly
+10V and 1mA.
-
Pin 7,
Alarm
output. Open collector transistor circuit with a resistive pull-up: logic low
signal means alarm condition. Correct functioning is signalled by +12V with10k
Ω
impedance. Maximum current sinking capability <10mA.
-
Pins 4 & 9: future upgrades
