2.11 - DB15 [U3 Datasheet]
The DB15 connector brings out 12 additional I/O. It has the potential to be used as an expansion bus, where the 8 EIO are data lines and the 4 CIO are control lines. The EIO are flexible I/O as described in Section 2.5, so can be used as digital input, digital, output, analog input, timer, or counter.
In the Windows LabJackUD driver, the EIO are addressed as digital I/O bits 8 through 15, and the CIO are addressed as bits 16-19.
0-7 FIO0-FIO78-15 EIO0-EIO716-19 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).
Table 2.11-1. DB15 Connector Pinouts
DB15 Pinouts
| |||
|---|---|---|---|
1 | Vs | 9 | CIO0 |
2 | CIO1 | 10 | CIO2 |
3 | CIO3 | 11 | GND |
4 | EIO0 | 12 | EIO1 |
5 | EIO2 | 13 | EIO3 |
6 | EIO4 | 14 | EIO5 |
7 | EIO6 | 15 | EIO7 |
8 | GND |
|
|
Figure 2.11-2. Standard DB15 pin numbers looking into the female connector on the U3
CB15
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.
RB12
The RB12 relay board 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.