Serial Port Specifications
Serial Topologies
5-6
WaveLAN/EC-S User’s Guide
Serial Topologies
5
Station to Station Topology
5
When a WaveLAN/EC-S device is configured for Station-to-Station
communication, the device that receives a message on its serial
port will translate the serial message into a network packet.
NOTE:
With a WaveLAN/EC-S device, a network packet can be
generated on any computer that has TCP/IP support and
is connected to a wired network. The WaveLAN/EC-S will
process the packet as though it were a serial data packet.
To this packet the device adds its own address and the destination
address of the remote device (as stored in the configuration or
passed along in the serial message), as well as other critical
information.
Next, it contends for time on the airwaves, then transmits the
packet over the radio. Finally, the device waits for an
acknowledgment from the destination device that the packet was
received without error. If it does not receive an acknowledgment,
and it has not exceeded its maximum retry count, the device will
retransmit the packet. This acknowledge and retry mechanism
provides for error-free communication.
Any device that receives packets over its radio will filter them
based on the destination address. Only the device with the correct
address will save the packet and send an acknowledgment back to
the source device.
Upon receiving a packet the device also extracts the original
message out of the packet and sends it out its serial port. If there
was an error in the packet, the device will ignore it causing the