sielco RTX19/1, User And Maintenance Manual, Page: 9 / 46

SIELCO srl - Via Toscana, 57/59 - 20090 BUCCINASCO (Mi) - ITALY - tel. 02 - 45713300 - www.sielco.org
RTX19/1 - USER & MAINTENANCE MANUAL - rev.1.4 - 02/17
Page 9
MONITOR
RS232
2
0
5
1
M
A
D
E
IN
IT
A
L
Y
REMOTE
MPX+ MPX-
10-75000 Hz
Receiver serial and parallel
remote control I/O ports
REMOTE CONTROL FUNCTIONS
Complete Receiver control is possible by remote through the serial RS232 port, which is located on the
rear of the equipment. A parallel one is also provided, on which some signal and control are alsowired.
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. A female DB9 or DB25 female goes to the PC port and a male DB9 connector to the
Receiver end. Appropriate software is needed for communication which is not supplied by SIELCO: simple
tests may be performed with standard Windows "Hyperterminal". Do not connect the cable with either the
Receiver or the PC on. For the command protocol refer to the EXC/RTX19 RS232 control User Manual.
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:
- Pins 1 & 5 Ground .
- Pin 2, “
modulation ok”
output. Open collector transistor circuit with a resistive pull-up: a low logic
state signals modulation is present on the received signal. On the contrary, a high logic state, + 12V /
10k
Ω
, warns on modulation loss. As alternate function the pin may be assigned to signal “ remote
lock” status.
- Pins 3 & 8, “ field good” . The insulated contacts of a relay are wired to these pins: the relay is default
driven by the received RF. When the field trespass the preset threshold, the relay is excited. The
contacts may be chosen through an internal bridge to be
"normally open (n.o.)" or "normally closed
(n.c.)" . Factory default is "n.o." . Alternatively the relay may be assigned to “ Alarm”
- Pin 6, "LF disable" input. Base input of a common emitter transistor with a resistive pull-up. A shorted
circuit to ground disables main LF outputs. Maximum voltage and current available are nearly +10V
and 1mA. Alternate function is “
Remote lock”
: when choosen, a shorted circuit disables front panel
setup functions.
- Pin 7, Alarm output. Open collector transistor circuit with a resistive pull-up: a logic low signal means
alarm condition. Correct functioning is signalled by +12V with10k
Ω
impedance. Maximum current
sinking capability <10mA. This pin may be alternatively assigned to signal “ Field good”
- Pins 4 & 9: future upgrades