Spectrum Controls 1769 User Manual page 12

1-
4 Chapter 1: Module Overview
24V to 3.3V
5V to 5V (analog)
BACKPLANE
CONNECTOR
RS-485
BUS
User's Manual Pub. 0300241-02 Rev. A
3.3V
POWER
5V Analog
Isolated
POWER
5V to 5V
power
Digital
Isolators
LPC2131
Processor
w/ Flash and
SRAM
710Vdc for one minute Field
to Backplane Isolation
Mercury
ASIC
From the readings taken by the converter, the module returns an accurate
temperature or resistance to the controller user program through the
microprocessor. The module uses two bidirectional serial ports for
communication, each using an optocoupler for isolation. A third optocoupler is
used to reset the microprocessor if the module detects a loss of communication.
x6 isolated channels
AD7785
20-bit ADC,
Reference, Mux,
+ and
Programmable
Gain In-Amp
710Vdc for one minute
Channel to Channel Isolation
TERMINAL
BLOCK
Current OUT IOUT
SENSE Input
SENSE
Current RTN IRTN