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distinction is usually drawn between intelligent and
unintelligent equipment. An intelligent device can process
the data pertaining to it, e.g. its address in the network.
An unintelligent device cannot do this. Many measurement
devices, scales, bar code readers and other equipment
are usually unintelligent. Consequently, communication
with such equipment is difficult. As a rule, Westermo
modems are transparent, i.e. the modem is ignored when
the computer and the equipment communicate with each
other. In order to solve the problem of communicating
with unintelligent devices, Westermo has developed intelligent
modems. This type of modem is addressable and equipped
with a data buffer. This means that the modem will add
necessary intelligence to the equipment. These addressable
modems can be used to address equipment. MA-43 can handle
the RS-485 interface and can address up to 239 addresses.
Up to 32 MA-43 units can be connected to the same bus
without a repeater. |
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