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8: Setup Mode: Channel Configuration
XPress DR+ User Guide 61
Pack Control
The packing algorithms define 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, allowing for very small delays for single characters, while keeping the
packet count low. 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 you do not need
specific functions.
Note: All bit positions in the table that are blank represent “don’t care” bits, for
that particular option, which can be set to either a 0 or 1 value.
Table 8-10. 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.