Copyright © Dr Robot Inc. 2005
19
to or from the device is disconnected
Alternate Packing Algorithm (Pack Control)
Enable
1
Pack Control
The packing algorithm defines how and when packets are sent to the network. The standard
algorithm is optimized for applications in which the unit is used in a local environment. The
alternate packing algorithm minimizes the packet count on the network and is especially useful in
applications in a routed Wide Area Network (WAN). Adjusting parameters in this mode can
economize the network data stream. Pack control settings are enabled in Flush Mode. Set this
value to 00 if specific functions are not needed.
Table V.12. Pack Control Options
Option 7
6
5
4
3
2
1
0
Packing Interval
Interval: 12ms
0
0
Interval: 52ms
0
1
Interval: 250ms
1
0
Interval: 5sec
1 1
Trailing Characters
None
0
0
One
0
1
Two
1
0
Send Characters
2-Byte Send Character Sequence
1
Send Immediately After Send chars
1
Packing Interval:
Packing Interval defines how long the unit should wait before sending
accumulated characters. This wait period is between successive network segments containing data.
For alternate packing, the default interval is 12 ms.
Trailing Characters:
In some applications, CRC, Checksum, or other trailing characters follow the
end-of-sequence character; this option helps to adapt frame transmission to the frame boundary.
Send Characters:
.
If 2-Byte Send Character Sequence is enabled, the unit interprets the sendchars as a 2-byte
sequence; if this option is not enabled, the unit interprets them independently.
.
If Send Immediately After Characters is not set, any characters already in the serial buffer are
included in the transmission after a "transmit" condition is found. If this option is set, the unit
sends immediately after recognizing the transmit condition (sendchar or timeout).
Note:
A transmission might occur if status information needs to be exchanged or an
acknowledgment needs to be sent.
