Command line interface
ADAPTIVE
mode is best suited for installations where the link between digitiser and
client is intermittent.
6.11.11 FIFO
Syntax:
FIFO
Instructs the DM24 to begin writing new blocks to Flash memory as for
FILING
, but
also to transmit data to clients. Data are transmitted in strict order, oldest first; the
DM24 will only transmit the next block when it receives an acknowledgement of the
previous block. Once a block is transmitted, it is marked as such in the Flash
memory, and may be overwritten later.
6.11.12 HEARTBEAT
Syntax:
interval
HEARTBEAT
When the DM24 is in
FILING
mode, it outputs status messages periodically over the
RS232 port (see Section 7.1 on page 95). This command changes how often these
messages are produced.
If the digitiser has been configured to dial out over a modem link (see
+MODEM
,
above), it will dial out whenever it generates a heartbeat message.
interval
is normally measured in whole units of 30 milliseconds. For example,
issuing
600
HEARTBEAT
will cause the DM24 to output heartbeat messages every (600 × 30ms) =
18,000 milliseconds = 18 seconds.
Alternatively, you can insert the word
HOUR
and specify
interval
in hours:
5
HOUR HEARTBEAT
The maximum value allowed for
HEARTBEAT
is 300,000,000 milliseconds, which is
2,500 hours (approximately 100 days).
If you connect to a digitiser in
FILING
mode using Scream!, Scream! will not detect
the digitiser until it has sent a heartbeat message. Therefore, you should use a
relatively short heartbeat interval if you have a continuously-connected instrument.
6.11.13 MS-GAP
Syntax:
interval
MS-GAP
The GCF protocol allows for transmitted data blocks to be acknowledged by the
receiver in order to improve the resilience of links. Unacknowledged blocks can be
re-transmitted immediately or stored for later transmission. MS-GAP sets the
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Issue U - December, 2021
