7 Functional Description of the Fieldbus Modules
7-20
7.3 Serial module FI 820F (Modbus Protocol)
7.3.1 Concept
The serial module is designed for connecting intelligent field
instruments via a serial interface. This applies especially to the
Modbus Protocol.
An RS232, RS422 or RS485 interface can be used. RS232 and
RS422 are working in duplex mode, whereas RS485 provides for
half-duplex operation. RTS and CTS are available for hardware
handshake.
Two serial interfaces are provided by the module. They are
electrically isolated from each other and from the CPU board.
Exclusively plug the fieldbus modules in slots F1 ... F4 !
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