Radiometrix Ltd, SpacePort Modem

page 11

configurator. The remote SPM unit should be on or in auto-standby mode.

as described in section 3.2: User Configurable Command.

commands to a remote SPM. The format for the remote command then becomes:

REMOTE

request to be executed on the appropriate SPM module.

Baud 600,1200,2400,4800,9600,19200,38400,57600,115200

Unit 0 to 15

Site 0 to 7

Shdn on/off

Flow hw/none

Serdly 2 to 255

Retry 1 to 63

Strtmsg on/off

displayed.

The SPM can be used for point-to-multipoint communications. One module must be considered to be the

master, which is used to address up to 15 remote units in any one site.

During normal operation, the base unit can be set to address another unit dynamically by entering the

provided the parameters are correct, the configurator is exited immediately. A period (‘.’) is sent to the

connected host device to indicate that the change has been registered and the SPM is now ready for

communications to the new unit address.

immediately, which is required to resume communications very quickly.

The SPM has a broadcast mutidrop mode which provides a mechanism for building a large networks.

This mode of operation is determined by the configuration command keyword ACKMODE being set to

OFF.

In broadcast mutidrop mode, the SPM does not implement network layer functionality related to data

packet routing, acknowledgement and retries. The connected host device should provide network layer

functionality.

The site code and unit address is still used by the radio modem when working in broadcast multidrop

mode. For a given multipoint network all radio modems within a group must contain the same site code

and unit address.