11
Chapter 3
Functional Details
External components
OMB-DAQ-TC-RACK front panel components are shown in Figure 2.
1
TC input channels 0 through 31 (32 mini-jack connectors)
4
ALARM
LED
2
POWER
LED
5
OPEN TC
LED
3
ACTIVITY
LED
Figure 2. OMB-DAQ-TC-RACK front panel components
OMB-DAQ-TC-RACK rear panel components are shown in Figure 3.
1
Factory
RESET
button
6
Chassis ground connector
2
USB
connector
7
40-pin
EXPANSION
connector
3
ETHERNET
connector
8
Eight digital input (
DIN
) pull-up switches
4
External power (
EXT DC
) connector
9
32 digital output (
DOUT
) pull-up switches
5
Power switch (
PWR
)
10
50-pin
DIGITAL I/O
connector
Figure 3. OMB-DAQ-TC-RACK rear panel components
USB connector
The USB connector provides USB communication.
Ethernet connector
The OMB-DAQ-TC-RACK has one 10/100 BASE-T, auto-negotiation, high-speed communication port. The
port connector is an RJ-45, eight-position connector. The Ethernet port accepts CAT-5 shielded or unshielded
twisted pair cable. The maximum communication distance without using a repeater is 100 meters.
External power connector
Connect the OMB-DAQ-TC-RACK-PS power supply to this connector. The power supply provides 5 VDC,
2 A power to the OMB-DAQ-TC-RACK.
TC input connectors, measurements, and LED
A thermocouple consists of two dissimilar metals that are joined together at one end. When the junction of the
metals is heated or cooled, a voltage is produced that correlates to temperature.
