Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: 248-295-0880
- 13 -
http://www.acromag.com
- 13 -
https://www.acromag.com
USB Connections
This transmitter is set up, configured, and calibrated with USB software that runs on
a USB-connected Windows-based PC (Windows 7 or later), or via our Agility mobile
APP installed on a compatible Android tablet or smartphone connected via a USB-
OTG cable. Refer to the drawing below to connect your PC or laptop to the
transmitter for reconfiguration and calibration using this software (the optional
connection to an Android smartphone/tablet would not usually require the use of
an isolator, because those devices are battery powered and do not make another
connection to earth ground).
WARNING:
The intent of mating
USB with this transmitter is so that
it can be conveniently set up and
calibrated in a safe area, then
installed in the field which may be
in a hazardous area. Do not
attempt to connect a PC or laptop
to this unit while installed in a
hazardous area, as USB energy
levels could ignite explosive gases
or particles in the air.
•
USB Signal Isolation is Required (See Below) -
You may use Acromag model
USB-ISOLATOR to isolate your USB port, or you can optionally use another USB
signal isolator that supports USB Full Speed operation (12Mbps).
•
Configuration Requires USB and Loop Power
- This transmitter draws power
from both the current loop and from USB during set up.
IMPORTANT:
USB signals to this unit are referenced to the potential of its internal
input 1 signal common which connects to the USB ground and shield ground, and
why we recommended you isolate USB to this device, or alternatively connect it to a
battery powered laptop with no earth ground connection. This would avoid a
potential ground loop between your PC and a grounded input 1 sensor. As a two-
wire device, the current output terminal is not earth grounded and its potential
relative to earth ground varies with the loop current through the load resistance
(net IR drop). Without isolation, the load IR drop would drive a potential difference
between the normally grounded current loop and a grounded USB connection at
the PC, causing a ground loop that would inhibit set up & calibration, or may even
damage the transmitter.
!
Note:
Output/Power to Transmitter must
be applied before USB connection
(See Output/Power Connections).