Data Sheet

AC4790
Datasheet
https://www.lairdconnect.com/
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1 AC4790 TRANSCEIVER
The compact AC4790 900MHz transceiver replaces miles of cable in harsh industrial environments. Using field-proven FHSS
technology, which needs no additional FCC licensing in the Americas, OEMs can easily make existing systems wireless with
little or no RF expertise.
1.1 Overview
The AC4790 is a member of Laird’s RAMP OEM transceiver family. The AC4790 is a cost effective, high performance,
frequency hopping spread spectrum (FHSS) transceiver designed for integration into OEM systems operating under FCC part
15.247 regulations for the 900 MHz ISM band.
AC4790 transceivers operate in a masterless architecture. When an AC4790 has data to transmit, it enters transmit mode and
starts transmitting a sync pulse intended for an individual radio or broadcasts to all transceivers within the same network and
range. Intended receivers synchronize to this sync pulse, a session begins, and data is transmitted. This instinctive dynamic
peer-to-peer networking architecture enables several transceiver pairs to carry on simultaneous conversations on the same
network.
To boost data integrity and security, the AC4790 uses Laird’s FHSS technology featuring optional Data Encryption Standards
(DES). Fully transparent, these transceivers operate seamlessly in serial cable replacement applications. Communications
include both system and configuration data via an asynchronous TTL serial interface for OEM host communications.
Configuration data is stored in an on-board EEPROM and most parameters can be changed on the fly. All frequency hopping,
synchronization, and RF system data transmission/reception is performed by the transceiver, transparent to the OEM host.
This document contains information about the hardware interface between a Laird AC4790 transceiver and an OEM host.
Refer to the AC4790 User Guide for software and configuration information.
The OEM is responsible for ensuring the final product meets all appropriate regulatory agency requirements listed herein
before selling any product.
Note: Unless mentioned specifically by name, the AC4790 modules are referred to as the radio or transceiver. Individual
naming is used to differentiate product-specific features. The host (any device to which the AC4790 is connected,
such as a PC) are referred to as OEM host.
1.2 Features
1.2.1 Networking and Security
 Masterless: True peer-to-peer, point-to-multipoint, point-
to-point
 Retries and acknowledgements
 API commands to control packet routing and
acknowledgement on a packet-by-packet basis
 FHSS for security and interference rejection
 Customizable RF Channel number and system ID
 Hardware Protocol Status monitoring
 Two generic input and output digital lines and integrated
ADC functions
1.2.2 Easy to Use
 Continuous 76.8 kbps RF stream rate
 Software selectable interface baud rates from
1200 bps to 115.2 kbps
 Low cost, low power, and small size ideal for
high volume, portable and battery powered
 applications
 All modules are qualified for Industrial
temperatures (-40 °C to 80 °C)
 Advanced configuration available using AT
commands