Model DT233-0600
Dual Two-Wire mV/TC Input Transmitters
Acromag, Inc. Tel: 248-295-0880
- 40 -
http://www.acromag.com
- 40 -
https://www.acromag.com
USB Interface…
PIN
SIGNAL DEFINITION
1
+5V Power (Includes Inrush Current Limiting)
2
Differential Data (+)
3
Differential Data (-)
4
NC
–
Not Connected
5
1
Power Ground (Connects to Signal Ground via ferrite bead)
SHLD
1
Signal Ground (Connects directly to Signal Ground)
1
Note:
Most Host Personal Computers (except battery powered laptops) will
connect earth ground to the USB shield and signal ground.
IMPORTANT
–
USB Isolation is recommended:
Input 1 of this transmitter is isolated
from both outputs and from Input 2 and can be connected to grounded or un-
grounded input signals
. However, the transmitter’s input
1 circuit ground is
connected in common to the USB power/signal/shield ground. This will in-turn
make a connection to earth ground at the PC when directly connected to the USB
port of a Personal Computer without using an isolator. Failure to connect USB
without isolation would connect the 1.25V input 1 bias supply to input ground if the
sensor is also earth grounded. This will interfere with operation and cause output 1
to shift. For this reason, USB isolation is strongly recommended when connecting to
a PC. Otherwise, in the absence of USB isolation, and when connected to a
grounded input 1 sensor, a battery powered laptop could be used to connect to the
unit, as the laptop does not normally connect to earth ground.
Enclosure & Physical
General purpose plastic enclosure for mounting on
35mm “T
-
type” DIN rail.
Dimensions
: Width = 17.5mm (0.69 inches), Length = 114.5mm (4.51 inches), Depth
= 99.0mm (3.90 inches). Refer to Mechanical Dimensions drawing.
I/O Connectors:
Four removable plug-in type terminal blocks rated for 12A/250V;
AWG #26-12, stranded or solid copper wire.
Program Connector:
USB Mini B-type, 5-pin (See USB Interface).
Case Material:
Self-extinguishing polyamide, UL94 V-0 rated, color light gray.
General purpose NEMA Type 1 enclosure.
Circuit Board:
Military grade fire-retardant epoxy glass per IPC-4101/98.
DIN-Rail Mounting:
Unit is normally mounted to 35mm, T-type DIN rails. Refer to
the DIN Rail Mounting & Removal section for more details.
Shipping Weight:
0.5 pounds (0.22 Kg) packed.
LED Indicators
Red Output Fault LED Indicators (Each Output, FLT1 & FLT2) -
Red FLT LED per
output loop. Blinking red continuously indicates the corresponding output load
resistance is too high to modulate loop current accurately, or the loop voltage level is
too low to drive the loop resistance at the desired current level. OFF is normal,
blinks for fault, or blinks once if the loop power is lost or the loop is opened.
