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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Interval: 12 msec

 

 

 

 

 

 

0

0

 

 

 

 

 

 

 

 

 

Interval: 52 msec

 

 

 

 

 

 

0

1

 

 

 

 

 

 

 

 

 

Interval: 250 msec

 

 

 

 

 

 

1

0

 

 

 

 

 

 

 

 

 

Interval: 5 sec

 

 

 

 

 

 

1

1

Trailing Characters

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

None

 

 

 

 

0

0

 

 

 

 

 

 

 

 

 

 

 

One

 

 

 

 

0

1

 

 

 

 

 

 

 

 

 

 

 

Two

 

 

 

 

1

0

 

 

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. The default setting is 00 (none).

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. The default setting is 0 (disabled).

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

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Lantronix 900-653-R manual Packing Interval, Trailing Characters, Send Characters, Pack Control Options