MGP WRM2 Spezifikationen PDF herunterladen (Seite 25)

TelePole WR/ Operating & Maintenance Manual Page 25

CPU Circuit (U6)

The micro-controller circuit manages all the meter activities.

EEPROM Back up Memory (U1)

The X2C04 is a 512-byte serial EEPROM (Electrically Erasable Prom).

The EEPROM stores threshold values, ID number and calibration factors values.

Communication Circuit

The CPU board contains two separate communication ports. One is the micro-controller

communication port used for the SMARTS communication:

J4/1 TxD - This is the serial data line transmitted from the meter. The logic level swings

are 0 to 5 Volts, and can be described as RS-232 TTL level. This circuit is able to drive

TTL, LSTTL, and CMOS inputs.

J4/2 RxD - This is the serial data line received in the meter. The meter accepts serial

data either in RS-232 signal levels (low: -3 to -15 Volts, high: +3 to 15 Volts) or TTL

levels (low: 0.8 Volts, high: 2.0 Volts).

J4/3, 6 - ground

J4/4 - + 5V

UART & Communication

The other communication port is used for the WRM system or COMBO system.

U12 - 82510 is connected to the CPU BUS, address 8700H.

J5/1 TxD - This is the serial data line transmitted from the meter. The logic level swings

are 0 to 5 Volts, and can be described as RS-232 TTL level. This circuit is able to drive

TTL, LSTTL, and CMOS inputs.

J5/2 RxD - This is the serial data line received in the meter. The meter accepts serial

data either in RS-232 signal levels (low: -3 to -15 Volts, high: +3 to 15 Volts) or TTL

levels (low: 0.8 Volts, high: 2.0 Volts).

J5/3 - ground

J5/6 - + 5V

J5/7 - trigger from the WRM transmitter

The communication port receives a trigger from the WRM transmitter and transmits the

data to the WRM system.

200msec.

RxD

TxD

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MGP WRM2 Spezifikationen Seite 25