Slave to Slave Exchanges
(Original Document)
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Introduction
The slave station makes exchanges with another slave station:
Ad1 to Ad0 Exchange
Exchange of slave Ad1 with slave Ad0, identified by address mark 1, allows the sender slave application program to communicate with the destination slave system (access to different objects, etc.).
NOTE: In all cases, the requests transit via the master in total transparency.
Exchange with the Application
Exchange of slave Ad1 with slave Ad2, identified by the address mark 2, is used to send messages from the sender slave application program to the destination slave application program.
Communication Function
Use of the SEND_REQ function by the slave requires a 6 byte table to be placed at the start of the transmission buffer which corresponds to the destination address.
The first six bytes of the transmission buffer are coded as follows:
Byte 1 (most significant)
Byte 0 (least significant)
Word 1
16#FE
16#00
Word 2
16#FE
16#05
Word 3
16#00
number of destination slave (Ad0 or Ad2)