VTI Instruments EX1629 User Manual page 61

Strain
Bridge
TEDS
Device
(i.e. DS2430
or DS2431)
NOTE Wiring the TEDS device to the EX1629 may not be as expected given the signal names used. The
correct wiring is provided above in Figure 3-12 as well as below:
RJ-45 Pin 4 (RCAL + / TEDS +) to DS2430/1 GND
RJ-45 Pin 5 (RCAL - / TEDS -) to DS2430/1 IO
The "+" and "-" indicators for the signal names indicate that, since negative voltages are used to
communicate with the TEDS device, the GND signal is actually more positive than the IO signal.
EX1629 Basic Operation
8-pin telcom
connector (RJ-45)
Pin 1 +Excitation
10K
Pin 8
+Excitation Sense
Pin 6 +Sense
Pin 3
-Sense
Pin 7
-Excitation Sense
10K
-Excitation
Pin 2
350
RJ-45 Pin#
12345678
120
User
IO Pin 5 -R Cal
GND
Pin 4
+R Cal
F
IGURE
Quarter-Bridge
(1 of 48 channels)
+Sense
Wagner
10K
+Cal
AGND
-Sense
-Cal
10K
AGND
Internal
55K
Rcal
3-12: TEDS W S
IRING CHEMATIC
www.vtiinstruments.com
+ Excitation
- Excitation
Instrumentation
Amplifier
+
x1
430 kHz 60.3 kHz
TRIFILAR
x10
LOW-PASS LOW-PASS ADC
FILTER
FILTER FILTER
x100
-
150
Hi
Lo
150
Shield
+Excitation Sense
-Excitation Sense
TEDS
COMM
External customer
shunt cal
resistor terminals
61