Siemens SIMATIC TIWAY 1 - Manual (Page 5)

THE UNILINK HOST ADAPTER
UNILINK HOST ADAPTER 1–4
USER MANUAL
The features of the UNILINK Host Adapter include:
D The adapter is noise hardened for factory floor use.
D There are internal diagnostics tests to check the internal operation
when powered-up or reset, and during normal operation. There is also a
selectable test mode that is set locally.
D The adapter can be reset locally with an internal switch or remotely
with a host issued command.
D The adapter supports secondary-to-secondary communications without
complex host software or additional hardware.
D The adapter is backward compatible with TIWAY I Host Adapter
software and drivers.
D The adapter includes an independent host communications port
capable of serial communications at 38.4K baud. This port operates
simultaneously with the network ports.
D This host port provides an optional advanced host protocol for improved
throughput and data integrity. This protocol also allows up to 32
UNILINK Host Adapters to be multidropped (via a modem) from the
same host computer RS–232–C/RS–423–A port.
D The adapter supports or provides the following TIWAY I features.
D The adapter supports the TIWAY I redundant media feature, providing
fault tolerant communications in case of a media failure.
D The adapter supports communication with multiple network secondary
devices concurrently for higher network throughput.
D The adapter supports concurrent network request processing. The host
computer does not have to wait for a request to complete before issuing
another request when using the advanced host communication
protocol.
D Commands are provided for background data collection. The adapter
can be configured to collect data for the host computer by storing the
most current data values in internal memory. Another command then
retrieves the data.