SCS PTC-IIex, Руководство пользователя

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10 Hostmode
***************************************
* SCS PTC-IIex Multimode Controller *
* Firmware Version V.2.8 Level 2 *
* BIOS Version 1.40 *
* (C) 1994-1999 SCS GmbH – Germany *
***************************************
PR PORT 1: SCS – DSP MULTI MODEM at 1200 baud.
Display 10.1.1: Hostmode Start message
If you want to control the PTC-IIex directly after starting with a hostmode program, the
baud rate should be set with the
SERBaud
command to a fixed value (refer to chapter
6.86 , page 72 ).
Please refer for more information to chapter 5.14 , page 35 and the explanations according
to the
TNC
command, chapter 6.95 , page 81 .
10.2 Modern Times
We hope you have already recognized the following warning:
The PTC-IIex expects a time input in milliseconds!
The settings of the time parameters are very important for proper Packet-radio operation!
How long to wait for the confirmation (
F
). How long is the time until it is checked if the
other station is still available (
@T3
), etc. The function and most of all the reliability of a
Packet-Radio connection depends on the time parameters.
Because of this, check the initialization files of programs you use in advance and very
carefully. Often the added examples are designed for a TNC 2. But the TNC 2 expects the
time inputs in 10 ms steps, e.g. for a TxDelay of 100 ms the value 10 has to be given for a
TNC 2! But the PTC-IIex needs the value in milliseconds, that means 100.
If you use the initialization files without checking, it could happen, that the very
important timing data becomes 10 times too low.
The most frequently done mistakes according to wrong times are:
•
At connect establishment all attempts of the PTC-IIex are transmitted in very short
distances.
•
On a DAMA-Digi it could happen that suddenly the connection hangs. Digi and PTC-
IIex exchange RR frames only.
Please search for the following commands,
F
,
T
,
W
,
@T2
and
@T3
, in the initialization file
of your program and check the settings. In any case you have to adjust the TX delay
(command
T
) due to your needs. It is possible to remove all other commands within the
initialization file or take the default settings.
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