8: Setup Mode: Channel Configuration
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 8-13 Pack Control Options
Option | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Packing Interval |
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Interval: 12 msec |
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| 0 | 0 |
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Interval: 52 msec |
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| 0 | 1 |
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Interval: 250 msec |
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| 1 | 0 |
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Interval: 5 sec |
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| 1 | 1 |
Trailing Characters |
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None |
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| 0 | 0 |
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One |
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| 0 | 1 |
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Two |
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| 1 | 0 |
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| 1 |
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Send Immediately After Send chars |
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| 1 |
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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
Send Characters
If
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
xDirect User Guide | 53 |