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tnc2upd.zsw
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1989-04-10
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2KB
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45 lines
TNC 2 Changes needed for ROSE to run in Back-to-Back Mode
(Items 1-6 are things that need to be changed for Net/Roms)
1) 32K Ram - Nice, but not needed for a Test Switch (busy switch; Usefull!)
2) TX Timeout timer - Net/Roms change C31 to 47uf for 60 timer, can't hurt
3) change clock to 4.9 mhz - Needed for 9.6kb links
4) DCDB (J1[db25] PIN 23) to JMP9 - Needed for back-to-back cable control lead
5) TL084 in U3 - Yes
6) J1 Pin 10 to J1 Pin 23 - NO, Pin 23 is used in cable
7) J1 Pin 10 to J1 Pin 20 - Back-To-Back Mode, Radio Support if not connected
Cables:
All connections are to J1 (DB 25)
Back-to-Back Cable needs:
CAPS mean this tnc, lower means all other tnc's
GND PIN 1 - gnd pin 1
GND PIN 7 - gnd pin 7 (Optional)
TXD PIN 2 - rxd pin 3
RXD PIN 3 - txd pin 2
* CTS PIN 5 - sel pin 23 (dcdb on sio) (Avoid collisions on async side, like)
* SEL PIN 23 - cts pin 5 (rtsb on sio) (hooking PTT to RF DCD between tnc's)
* NOTE: Due to a bug omit this line for Version 033189 or before
DTR PIN 20 - LO PIN 10 (Tell Switch to run with TXD=0 on Async Port)
Radio Port Cable Needs:
CAPS mean TNC, lower means Modem DB25
GND PIN 1 - gnd pin 1
TXD PIN 2 - rxd pin 3
RXD PIN 3 - txd pin 2
CTS PIN 5 - rts pin 4 (to radio keying circuit/ptt)
DSR PIN 6 - dtr pin 20 (depending on modem, may be optional)
GND PIN 7 - gnd pin 7 (Optional)
SEL PIN 23 - dcd pin 8 (Tie Modem DCD to sio dcdb)
Since we use NRZI created by the TNC, the TXClock and TXClock are not needed.
73, Tom