Omega Platinum DP32Pt - Connecting Inputs

PLATINUM
TM
Series Meters Quick Start Guide
6
Wiring Instructions
3.3 Connecting Inputs
The 10-pin input connector assignments are summarized in Table 1. Table 2 summarizes the universal
input pin assignments for different sensor inputs. All sensor selections are firmware-controlled and no
jumper settings are required when switching from one type of sensor to another. Figure 4 provides
more detail for connecting RTD sensors. Figure 5 shows the connection scheme for process current
input with either internal or external excitation.
Table 1 – 10-Pin Input Connector Wiring Summary.
Pin No.
Code
Description
1
ARTN
Analog return signal (analog ground) for sensors
2
AIN+
Analog positive input
3
AIN-
Analog negative input
4
APWR
Analog power currently only used for 4-wire RTDs
5
AUX
Only used with controller models
6
EXCT
Excitation voltage output referenced to ISO GND
7
DIN
Digital input signal (latch reset), Positive at > 2.5V, ref. to ISO GND
8
ISO GND
Isolated ground for serial communications, excitation, and digital input
9
RX/A
Serial communications receive
10
TX/B
Serial communications transmit
Table 2 – Interfacing Sensors to the Input Connector.
Pin
Number
Diff
Voltage
Process
Voltage
Process
Current
Thermo-
couple
2-Wire
RTD
3-Wire
RTD
4-Wire
RTD
Thermistor
Remote
Setpoint
1
Rtn
**
RTD2-
RTD2+
Rtn(*)
2
Vin +/-
Vin +/-
I+
T/C+
RTD1+
RTD1+
RTD1+
TH+
3
Vd +/-
I-
T/C-
RTD2-
TH-
4
RTD1-
RTD1-
RTD1-
5
V/I In
** Requires external connection to pin 4