Campbell Scientific TX312 High Data Rate GOES Transmitter - Manual (Page 11)

TX312 Transmitter
3.2 Diagnostics Switch
The Diagnostics switch has two purposes. Press and hold the Diagnostics
button for about 2 seconds. The Fault LED will flash once to indicate the
Failsafe has not been tripped. If the LED flashes twice, the Failsafe has
tripped. To clear the Failsafe, press and hold the diagnostic button for about
10 seconds. If the failsafe has tripped, the transmitter probably needs to be
returned for service.
The Failsafe circuit is designed to shut down a malfunctioning transmitter that
is transmitting too long or too often. The Failsafe circuit helps prevent
malfunctioning transmitters from interfering with other transmissions.
3.3 Communication Ports
3.3.1 RS-232 Port
The RS-232 port is a DB9 female connector configured as DCE. Only three
pins are used, transmit on pin two, receive on pin three, and ground on pin
five. Transmit is an output and receive is an input to the TX312.
The RS-232 port is used in conjunction with a PC and the 32 bit windows
compatible software, SatCommand. SatCommand software is used to read,
write, save, and transmit the configuration information from the computer to
the TX312 transmitter. SatCommand is also used to read status information
from the transmitter. The RS-232 port also supports dataloggers.
3.3.2 CS I/O Port
The CS I/O port is a Campbell Scientific Synchronous Device for
Communication (SDC) port. The CS I/O port is specifically designed to work
with Campbell Scientific SDC capable dataloggers. The CS I/O port is used
by Campbell Scientific dataloggers to transfer data from the datalogger to the
TX312 transmitter. The CS I/O SDC port allows other SDC devices and one
modem enabled device to be connected to the same port at the same time.
Only one device can be active at a time. This SDC port will allow the TX312
transmitter, the RF95A RF modem and a phone modem to be connected to the
CSI datalogger serial port all at the same time. The CS I/O port is a DB9 male,
voltage levels are TTL, pin out is:
1, 3, 5, 8 are not used
2 = Ground
4 = RXD (output)
6 = SDE (input)
7 = CLK (input)
9 = TXD (input)
3.3.3 SDI-12 Serial Port
The SDI-12 serial port is used by the TX312 only when a datalogger is not
used. Under most operating conditions, the datalogger is responsible for the
SDI-12 functions.
5