SDT 5000 User Manual
Document MBUD-0109v11
RTU connection hold
time
When the SDT 5000 establishes the connection with the host the
connection is maintained after the last message is sent or received for the
RTU connection hold time. This time is intended to give the host time to
process the message and generate a response if required.
The default value is 30 seconds.
RTU end to end
confirmation
If the RTU end to end confirmation flag is set to YES the data is not
cleared from the buffer until the host acknowledges the receipt of the
message.
If the RTU end to end confirmation flag is set to NO the data is cleared
from the buffer after it is transmitted to the host. There is no guarantee of
delivery.
The default value is NO.
RTU fast select
X25 support a mode of operation where the data is contained in the
connection request and the response is contained in the disconnect request.
This mode of operation is called fast select. Fast select is appropriate for
small messages < 128 bytes and the fastest response times are required.
There is much less overhead in sending the fast select message and so will
get to the host much quicker. The host must support fast select and be able
to generate the response in the disconnect message.
The default value is NO.
RTU buffer message
If the RTU data must be buffered by the SDT 5000 even when the data
cannot be sent to the host the RTU buffer message flag must be set to YES.
If the RTU buffer message flag is set to NO the data will be discarded after
the number of retries has been exceeded.
If the host destination address is not specified and the RTU buffer message
flag is set to YES the data will be sent to the host when it connects to the
SDT 5000.
Number of RTU retries
The number of RTU retries is the number of attempts to establish
communication with the host before determining that the host is
unavailable. If the host is unavailable or unreachable and
RTU buffer
message
is YES the message will be retried at the next schedule event.
Flush buffer
The RTU buffer may contain data that is no longer valid or is not required.
The command:
>trcfg flush yes
OK
will clear the entire buffer and all data will be lost.
Maximum receive
The maximum receive message size is used to terminate a message based
Version 1.1, 03/24/06
Page 33
