M48-169-BIM1H Datasheet, PDF (1/11 Pages) Radiometrix Ltd – VHF 500mW RS232 radio modem

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
Tel: [phone], Fax: [phone], www.radiometrix.com
M48-169-BiM1H
Issue 1, 29 October 2012
VHF 500mW RS232 radio modem
The M48-169-BiM1H presents M48 modem IC
combined with a BiM1H radio module and suitable
interface circuits, power supplies, connectors to
provide a complete RS232 radio modem interface.
Optionally, the board can be housed in an EAS80
extruded aluminium housing. In the simplest case, a
pair of these units (with suitable aerials and power
supplies connected, of course) can be connected
directly to the serial ports of a pair of industrial PCs
and the resulting wireless data link used without
any further installation or programming.
Figure 1: M48A-169.4125-BiM1H
The M48A is a simple, half duplex, transparent data link device. It provides a basic 4800 baud RS232
compatible path without the user needing to format, code, detect or otherwise worry about modifying his
existing datastream or providing extra 'control' lines. The user interface datarate, addresses and operating
parameters can all be easily re-programmed via the serial port.
It ought to be emphasised that the M48A is a very simple, easy to use, device. As supplied, it operates as a
4800 baud, transparent half-duplex data link. If required, there is an extensive range of programming
options, allowing user interface speed from 1200 to 76800 baud, hardware flow control, one to one, one to
many and broadcast addressing options, and acknowledge/re-transmit error handling protocols. Simple store
and forward repeater operation is also provided.
A good demonstration can be had by connecting a pair of PCs by their serial ports and a null-modem cable,
and setting up terminal emulators (4800 baud, asynchronous, local echo on) on both computers. Confirm
that good RS232 communication is present, and then replace the cable with a pair of M48A modems. The
resulting 'radio teletype' can be entertaining to play with.
Features
Usable range over 10km
500mW RF power output
5kbps pulse duration coded protocol
Synchronisation codes and checksum to reduce false triggering on noise
Programmable transmit address and four receive addresses
Programmable timing parameters (preamble length, etc)
Programmable serial modem baud rate (1200 - 76800 bps, half-duplex)
Addressable point-to-point and point to multi point
Packet acknowledge/resend (ACK) mode
Store and forward repeater function
Applications
Asset Tracking and Tracing
Automatic remote Meter Reading (AMR)
PDAs, organisers & laptops
Handheld / portable terminals
Remote operated vehicles
Data loggers
In-building environmental monitoring and control
Industrial (SCADA) telemetry and M2M systems
Fleet management, vehicle data acquisition
Radiometrix Ltd, M48A-169-BiM1H modem manual
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