- Emerson Remote Terminal Unit Instruction Manual

CI-ControlWave Express Introduction / 1-7
A supervisory circuit is used to switch to battery power when VCC falls out of specification.
For maximum shelf life, the battery may be isolated from the circuit by removing the
Backup Battery Jumper W3 from position 1 to 2 and then storing it in position 2 to 3. If the
real-time clock looses its battery backup a ControlWave Designer system variable bit
(_QUEST_DATE) is set. This bit can be used to post a message or alarm to the PC (see the
‘Systems Variables’ section of the ControlWave Designer Programmer’s Handbook D5125).
On 14MHz Ultra Low Power CPUs and 33 MHz Low Power CPUs, an on-board solar shunt
regulator is capable of charging a 7AH battery (6V or 12V) with the charging cycle
controlled by the MSP430 Microcontroller. Firmware turns on the shunt regulator when the
battery voltage exceeds the charge regulation threshold. When this happens, the shunt
regulator shorts the terminals of the solar panel connector thus eliminating further battery
charging. Note: Damage may result to the power supply components if the battery
charger is used without a battery present, i.e., do not connect a solar panel unless
a battery has first been connected.
An alternate battery connection is available through connector TB2 that provides power if
there is no power available from TB1.
Circuitry supports two Pulse Counter Inputs via connector TB5, and on 14 MHz Ultra Low
Power CPUs interface to a RTD via connector TB6.
Basic CPU components and features are summarized as follows:
• LH7A400 System-on-Chip 32-bit ARM9TDMI RISC Core microprocessor
• 512KB FLASH Boot/Downloader, 29LV040B, 90 nS, 8-bit access
• 2MB SRAM, 3.3V, 1M x 16, with Battery Backup
• 8MB simultaneous read/write FLASH, TSOP site
• 3 Serial Comm. ports
• Spread Spectrum clock for lower EMI
• Serial Real Time Clock with battery backup
• 8-Position configuration options switch bank (SW2), a 4-Position recovery switch bank
(SW1) and an 8-Position COM3 (RS-485) support switch bank (SW3)
• Coin cell socket accepts a 3.0V, 300mA-hr lithium battery
• LED Board (piggy-back)
• Nominal +6/12V or +12/24V) Power Input (both with Fail Safe Sequencer)
• Display/Keypad Interface
• 2 Pulse Counter Inputs with 1 second scan rate (Digital Input operation selectable)
• 10/100base-T Ethernet Port (Not on Low Power and Ultra Low Power CPUs)
1.3.2.1 CPU/System Controller Board Connectors
The CPU/System Controller Boards are equipped with up to ten (10) connectors that
function as stated in Table 1-1 below. Note: Additional connectors, not listed herein,
are for factory use only.
Table 1-1 - CPU/System Controller Board Connector Summary
Ref. # Pins Function Notes
J1 8-pin 10/100Base-T Ethernet Port RJ-45
J2 8-pin LCD Display/Keypad Intf. RJ-45
J3 20-pin IOBUS Intf. to Process I/O Board
J4 9-pin 9-pin Male D-type (COM1 - RS-232) Activated by W18
J10 20-pin LED Daughter Board Interface
J11 3-pin Alternate (COM1- RS-232) See Table 2-3B; Activated by W18
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