Timeout; Data Domain; End Character (232 End Character); Communication Sequence - DEUTSCHMANN AUTOMATION UNIGATE CL-CANopen Instruction Manual

Deutschmann Automation GmbH & Co. KG Implemented protocols with Universal Script - protocols application

11.2.3.3 Timeout

If the end character is set to "FF", the value that was set in the RX_Timeout parameter is acti-
vated and the time entered there is waited for with serial reception, or triggered for new charac-
ters. If the set time is exceeded without an event, the end criterion is reached and the characters
are copied onto the bus.

11.2.3.4 Data domain

The operating data is transferred to this field.

11.2.3.5 End character (232 End character)

If this character is defined, the gateway receives data from the RS232 interface up to this charac-
ter. The "Timeout" criterion can be defined as a special case. In this case, the gateway continues
to receive characters until a defined pause occurs. In the special case "Timeout" the "Length
232-byte" has no significance. At the transmit end, the gateway inserts the end character, if
defined, as the last character of a transmission.

11.2.4 Communication sequence

The useful data (data area) arriving via the fieldbus is copied in accordance with chapter 11.2.1
transparently into the RS232 data field and transferred via the RS interface, whereby the protocol
is supplemented in accordance with the configuration (start character, end character...). NO
acknowledgement is issued !
If the "Trigger byte" (see chapter 14) is active, data is sent only on a change of this byte. If the
"Length byte" (see chapter 15) is active, only as many of the following bytes as specified there
are transferred.
Receive data at the RS interface is evaluated in accordance with the configured protocol, and the
data field (data area (see chapter 11.2.1)) is sent to the fieldbus Master. If more characters have
been received than the fieldbus block length, the trailing bytes are truncated and an Rx Overrun
is indicated. If less have been received, padding with 0 occurs. If the "Length byte" is active, the
number of received useful data items is entered there. If the, "Trigger byte" is active, this is incre-
mented by one after each complete reception operation at the RS interface.
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