Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 13 -
http://www.acromag.com
[
13
]
https://www.acromag.com
USB Connections
This transmitter is configured and calibrated via configuration software that runs on
Windows-based PCs connected to the transmitter via USB (Windows XP or later
version required). Refer to the following drawing to connect a PC to the transmitter
for the purpose of configuration and calibration using this software.
WARNING:
The intent of mating USB with this
transmitter is so that it can be
conveniently configured 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 transmitter 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)
–
Acromag model USB-ISOLATOR
may be used to isolate the USB port, or optionally, 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 setup.
IMPORTANT
: USB logic signals to the transmitter are referenced to the potential of
the transmitter’s input ground. This ground is held in common with USB grou
nd and
USB cable shield ground.
The potential of the transmitter’s current output pin
(output minus) relative to earth ground will vary according to the load current and
load resistance (net IR drop). Without isolation, this IR drop would drive a potential
difference between the normally grounded current loop and the grounded USB
connection at the PC, causing a ground loop that would inhibit setup and
calibration, and may even damage the transmitter. This is why an isolated USB
connection is recommended. The use of an isolator can be avoided if a battery
powered laptop PC is used to connect to the transmitter, and the laptop has no
other earth ground connection, either directly or via a connected peripheral.
PERSONAL COMPUTER
RUNNING WINDOWS OS
1 METER USB CABLE
USB-A MALE
TO HOST USB PORT
HOST
USB
HOST USB SERIAL
PORT CONNECTOR
AT BACK OF PC
CONFIGURATION
SOFTWARE
ACROMAG
HOST PC RUNNING
USB-B MALE
D
E
V
IC
E
C
O
N
N
E
C
T
P
C
C
O
N
N
E
C
T
POWER
RESET
CONNECTION
USB-A MALE
TT SERIES USB TRANSMITTER CONNECTIONS
(REQUIRED)
USED FOR CONFIGURATION AND CALIBRATION OF THE TRANSMITTER IN A SAFE OR ORDINARY LOCATION
C
A
B
L
E
M
od
el
4
00
1
-1
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MODEL NO. - USB-ISOLATOR
Model 4001-112
Refer to Configuration Software Kit, Model TTC-SIP, which includes:
1 ea, Model 4001-113 USB Cable
1 ea, Model 4001-112 USB Cable
1 ea, Model USB-ISOLATOR
1 ea, Configuration Software CDROM 5040-944
USB MiniB MALE
USB MiniB Socket
(Front-Panel of Module)
12
–
32V
DC POWER
SUPPLY
TB3-5
TB3-6
MODEL TT2XX TRANSMITTER
NOTE: USER MUST MEASURE
OUTPUT/POWER SIGNAL TO
CALIBRATE OUTPUT
TB3
(OUTPUT)
TB4
(COM)
TB1
(INPUT)
TB2
(INPUT)
LOAD
!
