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Getting Started
Modular Products Chassis
55-Pin Backplane Connector Pin Configuration
The 55-pin backplane connector is used when your module is slotted into the
U2781A USB modular instrument chassis. For more details, refer to the Keysight
U2781A USB Modular Instrument Chassis User's Guide.
GND
GND
GND
NC
NC
GND
TRIG3
GND
TRIG4
GND
TRIG5
nBPUB
CLK10M
GND
NC
NC
11
10
Figure 1-1
SSI timing signal
GND
NC
VBUS
USB_D+, USB_D–
TRIG0~TRIG7
+12 V
nBPUB
CLK10M
STAR_TRIG
GA0,GA1,GA2
26
GND
GND
NC
NC
NC
TRIG2
GND
GND
TRIG6
STAR_TRIG
GA2
NC
NC
NC
9
8
7
55-pin backplane connector pin configuration
GND
GND
GND
NC
NC
NC
TRIG1
GND
TRIG0
GND
TRIG7
GND
GA1
GA0
NC
NC
NC
NC
6
5
4
Functionality
Ground
Not connected
USB bus power sensing input
USB differential pair
Trigger bus
+12 V power with 4 A current
USB backplane input detect
10 MHz clock source
Star trigger
Geographical address pin
Keysight U2701A/U2702A User's Guide
GND
GND
GND
VBUS
GND
USB_D–
GND
GND
USB_D+
+12 V
+12 V
GND
+12 V
+12 V
+12 V
+12 V
+12 V
+12 V
3
2
1
F
E
D
C
B
A
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