ashtech Z-Xtreme Operations & Reference Manual page 22

Table 2.2 Z-Xtreme Rear Panel Description
Number Component
3 Serial Ports
•A
•B
•C
•D
4 GPS antenna
connector
The current for the GPS antenna connector is limited to 150mA out of the RF
center conductor. It is short-circuit protected. If using a splitter or other RF
network, use an inner DC block suitable for 1-2 GHz, 50 ohms; maximum volt-
age back to the Z-Xtreme cannot exceed 15V.
12
Function
Each port delivers a 12V output on pin 1 for radio modem power
up. The total power delivered by all connectors is 1A, at 50%
duty cycle, 250ms duration. In case of a short-circuit, the power
is internally fused—the fuse has been tripped requiring the
removal of the short-circuit prior to activation of this power.
• A complete RS-232 port with full-handshaking. Port A can be
used for communications with a hand-held computer, an IBM
compatible PC, or a radio. Port A is used for transferring data
from the receiver to a computer, from a receiver to a receiver,
and all other communications to and from the receiver.
• A complete RS-232 port with full-handshaking. Port B can be
used for communication with the hand-held computer, an IBM
compatible PC, or a radio. Port B is used for transferring data
from the receiver to a computer, from a receiver to a receiver,
and all other communications to and from the receiver. This port
also carries an event marker input on pin 7.
• A complete RS-232 port with full-handshaking. Port C can be
used for communication with the hand-held computer, an IBM
compatible PC, or a radio. Port C is used for transferring data
from the receiver to a computer, from a receiver to a receiver,
and all other communications to and from the receiver. This port
also carries a 1PPS output on pin 7.
• A complete RS-232 port with full-handshaking. Port D is used
internally for communication with the optional internal radio
modem.
The RF connector is a standard TNC female receptacle wired
for connection via 50-ohm coaxial cabling to a GPS antenna
with an integral LNA. The connector shell is connected to the Z-
Xtreme common ground. The TNC connector center pin
provides +5VDC (to power the LNA) and accepts 1227 and
1575.42 MHz RF input from the antenna; the RF and DC
signals share the same path.
CAUTION
Z-Xtreme Operations and Reference Manual