
FASTRAK MANUAL
Rev. G
20
JUNE 2012
or
RS-232 communication, but not both. Once ordered, a system can be returned to the factory to
have its interface configuration changed for a nominal fee.
RS-422 is a differential transmit and receive I/O standard with a maximum error-free speed of 10
Megabits/second (technical specifications for RS-422, not FASTRAK) with operation possible at
a distance of 1200 meters with a speed of 100Kbits/second. The RS-422 does not use Handshake
functions for transmission and reception. The RS-422 transfer rate on a FASTRAK is the same
as for RS-232, but larger communication cables can be used, which is very important at higher
baud rates. The pinouts for this connector are as follow:
FASTRAK End
User End
1
TxB ------------------------------------------------------- RxB (Non-inverting receive input)
2
Not used
3
Not used
4
RxB ------------------------------------------------------- TxB (Non-inverting transmit output)
5
Not used
6
TxA ------------------------------------------------------- RxA (Inverting receive input)
7
Not used
8
Not used
9
RxA ------------------------------------------------------- TxA (Inverting transmit output)
7.11 Video Sync Input
The Video Sync Input is a subminiature telephone receptacle that mates with the video pickup
coil assembly (Video Sync Detector, optional). The Video Sync Input is located on the rear of
the SEU as shown in
. Video sync is available to minimize noise generated
by computer monitors, detected by the receivers. In order to use the video sync capability, the
Video Sync Detector cable must be connected to the video sync input connector on the
FASTRAK. The detector can then be positioned on the monitor surface where it will detect a
sync pulse. After sending the y2 external sync command to the FASTRAK, it will be synced to
the monitor. See
for more information on synchronization.
7.12 Power Input Receptacle
The Power Input is a 5 contact, female, shielded DIN type receptacle located on the rear panel of
the SEU as shown in
. Pin outs for this receptacle are as follows:
Pin #
Function
1
GROUND (Digital)
2
GROUND (Analog)
3
+5 VDC
4
-15 VDC
5
+15 VDC
NOTE:
Digital ground, pin 1 is
not
electrically shorted to analog ground, Pin 2 on the PCB.
(They are electrically connected in the power supply.)
7.13 Transmitter
The Transmitter is the device which produces the electro-magnetic field and is the reference for
the position and orientation measurements of the receivers. It is usually mounted in a fixed