Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 34 -
http://www.acromag.com
- 34 -
https://www.acromag.com
USB Interface
1
Note:
Most Host
Personal Computers
(except battery powered
laptops) will connect
earth ground to the USB
shield and signal ground.
A USB MINI-B socket is included for temporary connection to a PC or laptop to accomplish
reconfiguration and calibration. External USB isolation is required when input 1 is also
connected to an earth grounded input sensor (see
“IMPORTANT” below
). During
reconfiguration & recalibration, the transmitter receives its power from its DC power supply
(via its DIN rail bus or power terminal TB5), not USB. As such, you must connect power to the
unit when you connect USB.
CAUTION:
Do not attempt to connect USB in a hazardous environment. Transmitter should
be set up and configured in a safe environment only.
Data Rate:
USB v1.1 full-speed only, at 12Mbps. Up to 32K commands per second. USB 2.0
compatible.
Transient Protection:
Adds transient voltage protection on USB power & data lines.
Cable Length/Connection Distance
: 5.0meters maximum.
Driver:
No special drivers required. Uses the built-in USB Human Interface Device (HID)
drivers of the Windows Operating System (Windows XP or later versions only).
USB Connector:
5-pin, Mini USB B-type socket, Hirose UX60-MB-5S8.
USB PIN
DEFINITION
1
+5V Power (Transient Protected, but not used by the module)
2
Differential Data (+)
3
Differential Data (-)
4
NC
–
Not Connected
5
1
Power Ground (Connects directly to Signal Ground)
SHLD
1
Signal Ground (Connects directly to Signal Ground)
IMPORTANT
–
USB Isolation is Required:
Input 1 is isolated from input 2, each output, and
power and may be connected to grounded or un-grounded input sensors, but its circuit
ground also connects in common to the USB power/signal/shield ground, which in-turn
makes a connection to earth at the PC when directly connected to its USB port. Failure to
connect USB without adding isolation would short the 1.25V input return bias supply to input
1 ground if the sensor happens to also be earth grounded, interfering with operation,
truncating the negative input 1 range, and possibly shifting output 1. For this reason, USB
isolation is strongly recommended when connecting to a PC. In the absence of USB isolation
when connected to a grounded input sensor, a battery powered laptop could be used to
connect to the unit instead, as the laptop does not normally connect to earth ground.
Power
Unit power connections
are reverse-polarity
protected.
Power Supply (Connect at TB5 or via DIN Rail Bus Terminal):
6-32V DC SELV (Safety Extra
Low Voltage), 1.6W maximum. Observe proper polarity (reverse voltage protection is
included). Current draw varies with power voltage as follows (currents indicated assume
dual transmitter w/both current outputs driving 20mA
into 500Ω
).
SUPPLY
DT333 CURRENT CONSUMPTION
CAUTION:
Do not exceed
36VDC peak to avoid damage
to the unit. Terminal voltage
at or above 6V minimum must be
maintained across the unit during
operation.
6V
241mA Typical / 265mA Max
9V
155mA Typical/171mA Max
12V
114mA Typical / 125mA Max
15V
90mA Typical / 99mA Max
24V
57mA Typical / 63mA Max
32V
44mA Typical / 48mA Max
Power Supply Effect:
Less than
0.001% of output span effect per volt DC change.
!
!
