Serial Port Specifications
Introduction
5-2
WaveLAN/EC-S User’s Guide
Passthrough
5
You can use the Passthrough protocol to transmit a stream of
serial data from the serial (RS-232) serial port over the (radio)
network to one or more wireless receiving stations.
The data us passed using either:
■
TCP/IP protocol
■
RMP (Lucent proprietary protocol)
With this protocol, data is sent transparently to the receiving
device, as though the devices were directly connected via serial
cables. The data is not filtered or interpreted by either of the
WaveLAN/EC-S devices.
The Passthrough protocol should be used:
■
For applications where an RS-232 cable is to be replaced by a
pair of WaveLAN/EC-S devices without changing the network
protocols used by the terminals or application, or
■
When WaveLAN/EC-S devices are being used to form a client/
server or broadcast topology.
This protocol is most useful if the WaveLAN/EC-S is to be used as
a drop-in replacement for serial cable; i.e. the device which the
WaveLAN/EC-S is connected does not know that its data is being
transmitted by radio.
The Passthrough protocol has several configuration options, some
designed to optimize data throughput. These options tell the
WaveLAN/EC-S when to transmit data, to reduce communication
overhead when transmitting the data over the radio.
For example, sending one hundred (100) bytes of data takes
roughly half the amount of time as it takes to send one thousand
(1000) bytes. Through configuration, the user can help the
WaveLAN/EC-S decide how to minimize this overhead.
