Buck Rogers K4ABT Návod k obsluze stáhnout pdf (Strana 37)

The Packet Radio “2 N 1” Handbook by Buck Rogers K4ABT

Section 1; Packet Radio “The Basics” Section 2; The X1J4 System Node Operator’s (SNO) Handbook

Section II; TheNET X1J4 System Node Operators Handbook __ Page 37

Chapter 16 Section II

GATEWAY INTERFACING & SETUP:

(NOTE: This modification does not apply to TNC2’s or clones manufactured after July 1990)! (see the illustration of this

modification in the illustrations at the back of this handbook).

The following modification is required for TNCs that will be used in dual-or multi-frequency TheNET X1 configurations.

Since it does not impair normal operation in any way, we recommend it for all TNCs to be used with TheNET X1. You may

want to upgrade to dual-frequency operation later.

To make this modification, connect one end of a wire to pin 23 of the RS232 connector. Connect the other end of the wire

to pins 1-2-3 of JMP9 (these three pins are already hooked together on the circuit board).

This modification allows the TheNET X1 firmware to be configured for multi-frequency operation by jumping RS232 pins

10 and 23 together in the TNC-to-TNC cable.

SET BAUD RATE SWITCHES:

Follow the switch-setting instructions in the TNC2 manual. I have performed extensive reliability testing of TheNET X1 at

HDLC and RS232 baud rates up to 9600; it runs reliably at these high baud rates even at slow CPU clock speed.

For dual- or multi-frequency operation, I suggest setting the RS232 speed at 9600 baud (or the highest RS-232 port baudrate

i.e.; 19,200 baud’s for MFJ-1270"C") it makes a big difference in cross-frequency performance!

WIRE TNC-TO-TERMINAL CABLE:

To connect a host terminal to the TNC2, almost any standard RS232 cable will do (as long as pins 9, 10, and 23 are not

used).

CONFIRM TNC/NODE OPERATION:

Install the X1 EPROM; If you have the add-on DEViation PC board, install it while the TNC is open. Connect a terminal

to the TNC, power it up, and make sure that you get a sign-on message and that the unit still appears OK. Note the STAtus

LED should glow at half brilliance when compared to the other LEDS.

If it doesn't:

(1) You have made an error.

(2) You have installed a bad EPROM.

(3) Your TNC won't run at the fast CPU clock speed.

(4) HAVE YOU INSTALLED THE WIRE FROM PIN ONE (1) OF THE X1 EPROM TO PIN 8

OF THE MODEM HEADER?

NOTE: Step number 4 does not apply when using MFJ-1270”C” REV 11 or above!

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Buck Rogers K4ABT Návod k obsluze Strana 37