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Data exchange module 750-654
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Description of data exchange module
The data exchange module allows the exchange of 4 (5) bytes between different fieldbus
systems via multiplexing of a serial connection. The delay which is caused by the
multiplexor is < 5ms. The integrated watchdog function switches all outputs to zero if
there is no valid information for more than 200 ms via the multiplex connection.
The 128 bytes input buffer provides for high rates of data transmission. When using
lower rates of transmission speed you can collect the received data, with less priority,
without loosing data.
The 16 byte output buffer provides for faster transmission of larger data strings.
The data exchange module is connected peer-to-peer. For the wiring of the serial
multiplex connection the RxD and TxD cables are crossed. The following illustrations
show the peer-to-peer connection and the internal structure of the data exchange
module.
MM
SS
TxD
+
RxD
-
RxD
+
TxD
-
MM
SS
TxD
+
RxD
-
RxD
+
TxD
-
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Internal
control system
RxD+
RxD-
7 6 5 4 3 2 1 0
Output byte0
7 6 5 4 3 2 1 0
Output byte1
7 6 5 4 3 2 1 0
Output byte2
7 6 5 4 3 2 1 0
Output byte3
7 6 5 4 3 2 1 0
Output byte4
7 6 5 4 3 2 1 0
Input byte0
7 6 5 4 3 2 1 0
Input byte1
7 6 5 4 3 2 1 0
Input byte2
7 6 5 4 3 2 1 0
Input byte3
7 6 5 4 3 2 1 0
Input byte4
TxD+
TxD-
M
S
7 6 5 4 3 2 1 0
Control byte
7 6 5 4 3 2 1 0
Statusbyte