Power Supply Board Schematic; Radio Control Board; General Description; Microprocessor & Digital Interface - GE 12R II Series Technical Manual

GE
TRANSPORTATION
SYSTEMS
GLOBAL SIGNALING DIVISION
8.8.

Power Supply Board Schematic

See attached drawing 135630-000
9.

RADIO CONTROL BOARD

10.

General Description

The Radio Control Board is separated into 3 major functional areas. These three major functional areas are;
1) Microprocessor & serial interfaces
2) Audio Interfaces
3) External I/O Interfaces.
All External Interfaces terminate at the Radio Control board with the exception of the primary input voltage, which terminates
in the Power Supply Board and the Antenna connection that terminates in the RFPA Module.
10.1. Microprocessor & Digital Interface
10.1.1. Radio Processor Module
The Radio Processor Module (RPM) used in the 12RII Radio is an RCM2020 from Rabbit Semiconductor. This module
contains an 8-bit microprocessor with RTC, 128K RAM, 256K FLASH, and power up supervisory circuitry. The RCB
provides filtered +5V to the RPM. The RPM provides 5 8-bit programmable ports which are used on the RCB to provide
serial interface and digital control of the support circuits on the RCB and interfaces to other radio modules.
The FLASH memory on the RPM contains the radio operating firmware as well as the Radio Configuration File (RCF). The
RCF allows modification of the radio operating frequencies, audio parameters, Front Keypad ooperation (LC version Only)
and I/O programming.
10.1.2. Non-Volatile Memory
The RCB provides for non-volatile storage of board specific parameters in a serial EEPROM device. Also contained is the
board ID number and customer ID number.
10.1.3. Temperature Sensor
An onboard temperature sensor is used to provide temperature information for diagnostic purposes and for allowing some radio
parameters to be varied over temperature.
10.1.4. Serial Interfaces
The RCB supports the following External Serial Interfaces. All external serial interfaces are asynchronous.
RS-485
The RS-485 interface is used to communicate to the Front Panel Board in LC and SR radios. This interface is not used on the
RC version of the radio.
COE Communications Engineering Document
Author:
Keith Gilbertson
Date:
3/08/02
Title:
12RII FCC TECHNICAL MANUAL
Rev:
A
Pag
23 33
of
e: