RTcom Radio Modems Especificaciones descargar pdf (Pagina 17)

Sync

ABACOM TECHNOLOGIES • 67 Hamptonbrook Dr • Etobicoke • ON • M9P 1A2 • Canada • Tel: +416-242-3120 • Fax: +416-242-2697

Cyphernet Radio Transceiver with RS232 Interface and Controller

Standard Firmware Description

The Cypernet comes complete with an EEPROM held firmware package giving the following operating perfor-

mance.

In standby mode the unit continuously searches the ether for transmissions. On detection of preamble or data

the interface signals the host that the channel is busy using the CD line and opens the RX(data) output to the

PC. The host can then look at the incoming data and respond as and if required.

Data transmission is initiated simply by sending a data packet in the above format from the DTE to the inter-

face. Upon detection of the start of a data packet (normally the start of the preamble 101010 pattern) the in-

terface automatically switches from receive to transmit mode and thereafter data is modulated onto the RF

carrier.

5ms Preamble UART Sync Character Data with or without CRC

User Programming Option

The user may purchase or construct their own in-circuit programming adaptor for the Cyphernet. This will per-

mit the user to replace the firmware supplied with their own firmware package giving them a totally cus-

tomised solution for their specific needs.

Files destined for the programmer need to be converted into binary format. This is simply ac-complished by

using one of the many standard off the shelf PIC compilers. The programming adaptor is controlled via the

parallel port of the PC. It comes complete with a DOS based package permitting both reading and writing to

the EEPROM data and program memory via the Cyphernet 9-pin D-Type connector.

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RTcom Radio Modems Especificaciones Pagina 17