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30 Texas Instruments Communication Driver Manual

Data Communication Unit (DCU) TI 305 Series

The Data Communication Unit (DCU) enables the TI Series 305 PLCs to interface with external

devices. The DCU only supports the master/slave protocol. The Operator Station will be the master

device and the DCU will be the slave. When selecting a port use in the PLC Name and Port

Parameters Table, use TI-HL/M (Texas Instruments Hostlink master/slave). The two DCU models are

305-02DM and 305-03DM. The 305-02DM has one RS422 port and can be multi-dropped from a

network with up to 90 (405 or 305) controllers. This model also supports a point-to-point connection.

The 305-03DM has one RS232 port and must use a point-to-point connection.

Data Communications Unit

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Siemens SIMATIC TI505 Wartungshandbuch Seite 33