11
USB DIRECTOR HUBS
3. Configuration
3.1 The Cable Connections (DB9 Female)
IMPORTANT
Note that for full duplex (shown in the diagram below),
the differential pair T
A
and T
B
should be together in one
twisted pair, and R
A
and R
B
should be together in
another twisted pair. Half duplex uses only one twisted
pair.
3.2 The Two-Position DIP Switch
Both USB Director Hubs have a two-position DIP switch.
This switch connects the signal ground to chassis
ground.
3
→
TA
transmit data negative
7
→
TB
transmit data positive
8
→
RA
receive data negative
4
→
RB
receive data positive
5
→
signal ground
1, 2, 6, 9
no connect