MFJ MFJ-1270C, Системное руководство

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MFJ-1270C/1274C MANUAL COMMANDS
Page 169
NULL S n Mode: Packet Default: 0
Parameters:
n 0 - 30, Specifying the number of <NULL> characters to send
after <CR> or <LF>.
This command specifies the number of <NULL> characters (ASCII code $00) to
send to the terminal after a <CR> or <LF> is sent. In addition to setting this
parameter value,
NUCR and/or NULF must be set to indicate whether nulls are to
be sent after <CR>, <LF>, or both. Devices requiring nulls after <CR> are
typically hard-copy devices requiring time for carriage movement. Devices
requiring nulls after <LF> are typically CRTs which scroll slowly. Extra null
characters are sent only in Converse and Command Modes.
P ACLEN n Mode: Packet Default: 128
Parameters:
n 0 - 255, Specifying the maximum length of the data portion of
a packet. The value 0 is equivalent to 256.
The MFJ TNC will automatically transmit a packet when the number of input
bytes for a packet reaches n. This value is used in both Converse and Transparent
Modes.
If you perform file transfers, you should experiment with both
MAXFRAME and
PACLEN . If the link is good, there is an optimum relationship between the
parameters set by these commands so that the maximum number of characters
outstanding does not exceed the packet receive buffer space of the MFJ TNC
receiving the data.
NOTE : Although there is no requirement for two TNCs exchanging data
to have the same PACLEN value, allowing more than 128 characters of
data in a packet may be incompatible with some varieties of TNCs.