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1200DD Series Digital Data Display Manual
1200DD - 2-4
Revision 1.8
Pin #
Name
Description
1
GND
Chassis ground
2
Tx-
Transmit A (Tx-) Output
3
Rx+
Receive B (Rx+) Input
4
PPS+
1 PPS Interrupt in +
5
+12V
+12 Volts DC out
6
PPS-
1 PPS Interrupt in -
7
Tx+
Transmit B (Tx+) Output
8
Rx-
Receive A (Rx-) Input
9
GND
Chassis ground
Figure 2-7: GPS Serial Port Pin Definitions
2.2.
MOUNTING
The model 1200DD is equipped with rack mounting angles and fits into a standard 19 inch by 3 1/2 inch
(483 mm x 90 mm) 2 rack unit space. The model 1201DD is equipped with rack mounting angles and fits
into a standard 19 inch by 1 3/4 inch (483 mm x 45 mm) 1 rack unit space.
2.3.
POWER
The 1200DD series displays come with an auto-ranging DC voltage adapter that automatically
senses the input voltage. Power should be applied by connecting a 3-wire grounding type
power supply cord to the power entry module on the DC voltage adapter. The power cord
should be minimum 18 AWG wire size; type SST marked VW-1, maximum 2.5 m in length.
The DC cable of the voltage adapter should be connected to the DC power jack on the rear
panel.
2.4.
GPS RECEIVER INSTALLATION
The model 1200DD-GPS and 1201DD-GPS displays are designed to work with the Trimble Accutime
2000 Smart Antenna that can be located up to 1000 feet from the display. The Smart Antenna houses the
GPS receiver, antenna, power supply and other support circuitry in a sealed, shielded, self-contained unit
with a digital interface to the main unit. The GPS Smart Antenna also receives power from the main unit
through the connection cable.
2.4.1. Mounting the GPS Smart Antenna
The smart antenna's enclosure is completely waterproof and is designed for outdoor installation. It is
protected against jamming signals and thus is suitable for reliable operation in most environments. Select
an outdoor location for the antenna, like the roof of your building that has a relatively unobstructed view of
the sky. Dense wood and concrete or metal structures will shield the antenna from satellite signals. The
antenna can receive satellite signals through glass, canvas and thin fibreglass; thus it may be mounted
inside a skylight, if an outdoor location is not possible.