- Emerson Remote Terminal Unit Instruction Manual

1-2 / Introduction CI-ControlWave Express
microprocessor with 32-bit ARM9TDMI Reduced Instruction Set Computer (RISC) is the
core of the CPU/System Controller Board. In addition to the microprocessor and control
logic, the CPU/System Controller Board includes two fixed RS-232 Communication Ports
(COM1 & COM2), 1 configurable (RS-232/RS-485) Communication Port (COM3), 2MB of
battery backed Static RAM (SRAM), 512kB Boot/Downloader FLASH, 8MB simultaneous
read/write FLASH, SPI I/O Bus Connector, Serial Real Time Clock, Power Supply
Sequencer, and Display/Keypad Interface. A piggy-back mounted LED Board provides
Power Good, Watchdog, Idle, Transmit and Receive (for each of the three communication
ports), and six Status LEDs. Additionally, when interfaced to an optional LCD Display, the
unit displays run time status information.
Figure 1-1 - ControlWave Express Component Identification
An optional Process I/O Board provides the circuitry and field interface hardware necessary
to interconnect all assigned field I/O circuits except the pulse counter circuits and the RTD
input that are located on the CPU/System Controller Board. Non-isolated power is
generated and regulated by the CPU/System Controller Board that provides +3.3Vdc for all
logic and bulk power for I/O field circuits from a nominal bulk +6Vdc, +12Vdc or +24Vdc
power source (depending on the type of CPU). +1.8Vdc, used by the ARM microprocessor, is
derived from the regulated 3.3Vdc logic power.
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