0-7 FIO0-FIO7
8-15 EIO0-EIO7
16-19 CIO0-CIO3
These 12 channels include an internal series resistor that provides overvoltage/short-circuit
protection. These series resistors also limit the ability of these lines to sink or source current.
Refer to the specifications in Appendix A.
All digital I/O on the U3 have 3 possible states: input, output-high, or output-low. Each bit of I/O
can be configured individually. When configured as an input, a bit has a ~100 kΩ pull-up
resistor to 3.3 volts. When configured as output-high, a bit is connected to the internal 3.3 volt
supply (through a series resistor). When configured as output-low, a bit is connected to GND
(through a series resistor).
DB15 Pinouts
1Vs 9CIO0
2CIO1 10CIO2
3CIO3 11GND
4EIO0 12EIO1
5EIO2 13EIO3
6EIO4 14EIO5
7EIO6 15EIO7
8GND
2.11.1 CB15 Terminal Board
The CB15 terminal board connects to the LabJack U3’s DB15 connector. It provides convenient
screw terminal access to the 12 digital I/O available on the DB15 connector. The CB15 is
designed to connect directly to the LabJack, or can connect via a standard 15-line 1:1 male-
female DB15 cable.
2.11.2 RB12 Relay Board
The RB12 provides a convenient interface for the U3 to industry standard digital I/O modules,
allowing electricians, engineers, and other qualified individuals, to interface a LabJack with high
voltages/currents. The RB12 relay board connects to the DB15 connector on the LabJack, using
the 12 EIO/CIO lines to control up to 12 I/O modules. Output or input types of digital I/O
modules can be used. The RB12 is designed to accept G4 series digital I/O modules from
Opto22, and compatible modules from other manufacturers such as the G5 series from Grayhill.
Output modules are available with voltage ratings up to 200 VDC or 280 VAC, and current
ratings up to 3.5 amps.
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