ZULU Modem
Operation Overview
The ZULU MODEM Module provides a simple Modem interface to the host controller. It han-
dles all RF data communications automatically and without any requirement from the user (RF
packetising , Preamble, Encoding, CRC Check etc).
With this powerful high-speed Radio link. The following networks can be realised;
One-to-
One-to-One operation; for point to point data communication
One-to-Many
One-to-Many; A network consisting a master and many slaves (the receivers all have the same
address)
Many-to-
Many-to-One; where the transmitters all send to a single receiver address.
Because each ZULU MODEM can contain a unique address, multiple ZULU networks can co-
exist in the same area.
Broadcast operation; where a single master Zulu MODEM addresses many ZULU MODEMS
concurrently. (using many ZULU MODEM modules set to the same address),
Operating Modes
Configuration Mode: In Configuration mode the Zulu MODEM can receive a number of com-
mands and the internal registers can be preset to control its operation. In this mode the Zulu
MODEM is ‘Offline’ and cannot send or receive RF data.
Normal Operation : ZULU MODEM is ’Online’ automatically transmitting and receiving data
from its host and across the RF network.
Each ZULU MODEM has its own preset address. This is user set during configuration. Any
data received is examined and the address header embedded within the data packet is com-
pared with its address. Only data received with matching address will be processed and out-
put to the host, all other data will be discarded.
All ZULU MODEM modules are shipped with a default address of 7E7E7E.
The ZULU MODEM contains an on-board data buffer equal to two data packets. Therefore if
RTS is asserted (then the host is unable to receive data) the module will store a max of two
data packets, all further data packets received will be discarded.
DS-ZULU Modem-1
RFSOLUTIONS [ RFSOLUTIONS.LTD ]
