ADLINK USB-2405 - Manual (Page 26)

16 Introduction
1.9 Connections
The USB-2405 module is equipped with four BNC connectors and
one 4-pin removable spring terminal connector, with pin assign-
ment as labeled.
BNC connector polarity is as shown.
Figure 1-11: BNC Connector Polarity
Positive (+)
Negative (-)