This type of communication is available for Premium PLCs:
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Via the terminal port associated with the RS485 physical layer
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Via the host channel of the processor or TSX SCY 21601 module with:
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a PCMCIA TSX SCP 111 card associated with the RS232 physical layer
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a TSX SCP 112 PCMCIA card associated to 20 mA current loops
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a TSX SCP 114 PCMCIA card associated with physical layers RS422 and RS485
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Via the built-in link of the TSX SCY 21601 module associated with the RS485 physical layer
The terminal port on Premium processors can only process one communication function of type:
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INPUT_CHAR
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PRINT_CHAR
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OUT_IN_CHAR
For communication via a Terminal port, the maximum frame size is 120 bytes per communication function.
The PCMCIA cards can process 8 communication functions simultaneously in Premium PLCs.
The built-in link of the TSX SCY 21601 module can process 8 communication functions simultaneously.
For communication via a PCMCIA card or built in link, the maximum frame size is 4K bytes per communication function.
