OM-USB-1208HS Series User's Guide
Functional Details
12
Figure 4. DIFF mode pinout
* Pins 29 and 30 are "NC" on the OM-USB-1208HS. Pins 32 and 33 are "NC" on the OM-USB-1208HS and
OM-USB-1208HS-2AO.
Signal connections
Analog input
You can configure the analog inputs for SE or DIFF mode.
With SE mode, connect up to eight inputs to screw terminals
AIN0
to
AIN7
. Refer to Figure 3 on page 11 for the
location of these pins. SE mode requires two wires:
Connect one wire to the signal you want to measure (
AINx
).
Connect one wire to the analog ground reference (
AGND
).
In SE mode, the input voltage ranges are ±10 V, ±5 V, ±2.5 V, 0 to 10 V.
With DIFF mode, connect up to four DIFF inputs to screw terminals
AIN0+/AIN0
–
to
AIN3+/AIN3
–.
Refer to
Figure 4 for the location of these pins. DIFF mode requires two wires plus a ground reference:
Connect one wire to the high/positive signal (
AINx+
).
Connect one wire to the low/negative signal (
AINx
–
).
Connect one wire to the analog ground reference (
AGND
).
In DIFF mode, the input voltage ranges are ±20 V, ±10 V, and ±5 V. The voltage level on each AINx input is
limited to ±14 V.
For more information on analog signal connections
For more information on analog input connections, refer to the
OMB-DAQ-2400, OM-USB, OM-WEB, and OM-
WLS Series General Guide to Signal Connections
(available on our web site at
www.omega.com/manuals/manualpdf/M4830.pdf
Analog output
You can connect up to four analog output connections to screw terminals
AOUT0
to
AOUT3
. Refer to Figure 3
on page 11 for the location of these pins.
