Motorola M12 Oncore User's Guide download pdf (Page 32)

Chapter 3 – Receiver Description

Motorola GPS Products - Oncore User’s Guide

Operational

Overview

SYSTEM INTEGRATION

The Motorola Oncore receiver is an intelligent GPS sensor intended to be used as a

component in a precision positioning, navigation or timing system. The Oncore

receiver is capable of providing autonomous position, velocity, and time information

over a serial TTL port. The minimum usable system combines the Oncore receiver,

antenna, and an intelligent system controller device.

Interface Protocol

Description

INTERFACE PROTOCOL

The Motorola Oncore receiver has up to two TTL serial data ports. The first port is

configured as a data communications equipment (DCE) port and provides the main

control and data path between the Oncore receiver and the system controller. The

second port is for RTCM DGPS correction input (M12+ and GT+ only). Refer to table

below for the interface protocol parameters. To connect the Oncore to an RS-232

port, one must supply circuitry to convert TTL to RS-232 and RS-232 to TTL.

The I/O port operates under interrupt control. Incoming data is stored in a buffer that

is serviced by the Oncore receiver's operating program. This buffer is serviced every

1.0 seconds.

Table 3.10: Oncore Interface Protocol

Format Motorola NMEA0183 RTCM SC-104

Type Binary ASCII 1 & 9

Direction In/out In/out In/out

Port 1 1 2

Baud Rate 9600 4800 2400, 4800, 9600

Parity None None None

Data bits 8 8 8

Start/stop 1/1 1/1 1/1

Revision 5.0 08/30/02

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Motorola M12 Oncore User's Guide Page 32