Connector
Use
PPS TRIG IN
Input terminal for pulse per second (PPS) timing reference. PPS TRIG IN is a female
SMA connector with an impedance of 50 Ω, and it is a single-ended input channel.
PPS TRIG IN accepts 0 V to 3.3 V TTL and 0 V to 5 V TTL signals. You can also use
this port as a triggered input (TRIG IN) that you control using NI-USRP.
GPS ANT
Input terminal for the GPS antenna signal. GPS ANT is a female SMA connector
with a maximum input power of -15 dBm and an output of DC 5 V to power an
active antenna.
Notice
Do not terminate the GPS ANT port if you do not use it.
Table 16. Connector Descriptions
GPIO Connector
AUX I/O Connector
Pin NI-USRP Terminal
Name
USRP RIO (LV FPGA) IO
Node Terminal Name
8
7
6
5
4
3
2
1
15 14 13 12 11 10
9
1
3.3 V
3.3 V
2
GPIO 0
AUX I/O 0
3
GPIO 1
AUX I/O 1
4
GPIO 2
AUX I/O 2
5
GPIO 3
AUX I/O 3
6
GPIO 4
AUX I/O 4
7
GPIO 5
AUX I/O 5
8
GPIO 6
AUX I/O 6
9
GPIO 7
AUX I/O 7
10 GPIO 8
AUX I/O 8
11 GPIO 9
AUX I/O 9
12 GPIO 10
AUX I/O 10
13 GPIO 11
AUX I/O 11
14 0 V
0 V
15 0 V
0 V
Table 17. GPIO Connector Pin Assignments
© National Instruments
35
USRP-2940/2942/2943/2944/2945 Getting Started
