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Electrical Assembly; Input/Output Board; Power Distribution Board - Honeywell MIWI350 Installation And Operation Manual

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4 Electrical Assembly

4 Electrical Assembly

4.1 Input/Output Board

OPTIONAL EXTERNAL
DC POWER SOURCE,
5 -15V
BATTERY 'Y' CABLE
MAIN
SWAP OUT
BATTERY
BATTERY
OR EXT PWR
FOR
BACKUP
HAZARDOUS
BATTERY
LOCATIONS
LOW FREQ, DIGITAL INPUTS:
ISOLATED DRY CONTACTS
UMB REED SWITCHES
ROTARY METER
SENSORS

4.2 Power Distribution Board

Modem Power Control enables an instrument to turn the power to a modem "OFF" or "ON" only when
required for scheduled calls and maintenance. It can be used to reduce the amount of power required by
the modem assembly so that non-rechargeable batteries can be used or even smaller solar panels can be
installed.
Refer
Figure 4-2
for more information.
TB1-1
TB1-3
Figure 4-1: Input/Output Board or EVC Board
JP1 and JP2 RS232/RS485 Selection Jumpers
Set both to A-B for RS485, or B-C for RS232
TB4-1
TXD
TXD
RS-232 SERIAL
TB4-2
RXD
RXD
COMMUNICATION
GND
GND
TB4-5
PULSE OUTPUT A
PULSE OUTPUT B
PULSE OUTPUT C
PULSE OUTPUT D
TRANSDUCER 1
TRANSDUCER 2
TEMP PROBE
TAMPER SWITCH
METROLOGICAL JUMPER
TB4 PULSE OUTPUTS AND ALARM
ARE NON-POLARIZED
DEVICE
PRESSURE
PRESSURE
Honeywell
| 15

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