Siemens ADVANCE NETWORK COMMUNICATIONS BOARD/DATANET 20005 User Manual download pdf (Page 49)

Command Descriptions, Continued

“hdlc” Command

This command may be used to override default values for several

parameters related to the DataNET protocol. Specific forms of the

command are:

hdlc setuptime

Displays the current “setup time” value, in

microseconds. This is the time that the

ANCB/DN board will transmit a “preamble”

pattern on a DataNET link before starting

the actual data frame. The preamble

allows time for the receiver circuitry at the

far end of the link to adjust to the incoming

signal’s amplitude, phase, and frequency.

The default setup time is 2500

microseconds.

hdlc setuptime time

Sets the DataNET setup time to the value

given, in microseconds. The new setup

time value is saved in non-volatile

memory.

hdlc window

Displays the transmit “window” size used

by DataNET. This is the number of I-

frames (Information frame) that a station

may send before it must receive a low-

level acknowledgment from the receiving

station.

hdlc window num

Sets the transmit window used by ports 1

and 2 on the ANCB. The parameter “num”

must be a number 1 through 7. The

default window size is 7.

2000592-001 Command Summary • 39

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Siemens ADVANCE NETWORK COMMUNICATIONS BOARD/DATANET 20005 User Manual Page 49