Modes Of Operation - Laird RM024 User Manual

RM024
User Guide

Modes of Operation

The RM024 has three different types of interface modes:

Transparent Mode

API Mode

Command Mode
The first two modes are used to transmit data across the RF and the third mode is used to configure the radio.
Transparent Mode
When operating in transparent mode, the RM024 can act as a direct serial cable replacement in which RF data is
forwarded over the serial interface and vice versa. In transparent mode, the radio needs to be programmed with
the MAC address of the desired recipient. The destination address can be programmed permanently or on-the-
fly.
When transparent mode is used, data is stored in the RX buffer until one of the following occurs:

The RF packet size is reached (EEPROM address 0x5A)

An Interface timeout occurs (EEPROM address 0x58)
All parameters can be configured by entering Command Mode using either AT commands or by toggling the
Command/Data pin low on the transceiver.
Transparent mode is the default radio operation mode.
API Mode
API mode is an alternative to the default transparent operation of the RM024 and provides dynamic packet
routing and packet accounting abilities to the OEM host without requiring extensive programming by the OEM
host. API mode utilizes specific frame-based packet formats, specifying various vital parameters used to control
radio settings and packet routing on a packet-by-packet basis. The API features can be used in any combination
that suits the OEM's application specific needs.
The RM024 has three API functions:

Send Data Complete

Receive API

Transmit API
For additional details and examples, please refer to the
Command Mode
Command mode is used to configure and poll for status of the transceiver. Command mode can be entered by
issuing the Enter AT Command string or by setting the CMD/Data pin low. Details of using command mode to
configure the RM024 are detailed in
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/ramp
API Operation
Configuring the RM024.
6
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