┌──────────────────────────────────────────────────────────┐
│ #### ### ### # # #### ##### ### │▓
│ # # # # # # # # # # # # │▓
│ # # # # #### #### ### # #### │▓
│ # # # # # # # # # # # # │▓
│ # # # # # # # # #### # # # │▓
│ │▓
│ # # #### ### #### ## ### # # ### │▓
│ # # # # # # # # # # # # # # # │▓
│ # # # ### # # ### # ### ## #### │▓
│ # # # # # # # # # # # # # # # │▓
│ ##### #### # # #### ## # # # # # # │▓
└──────────────────────────────────────────────────────────┘▓
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
RS-232 INTERFACE FOR SPECTRUM COMPUTERS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) KOHASOFT'1991
(c) UAЗPRQ'1992
продолжение
█8┌───┬───┬─────┐11
D0' █────┤DO │ PT│GATEO├────┐
█ 7│ │ │ │14 │
D1' █────┤D1 │ │GATE1├────o──>+5V
█ 6│ │ │ │16 │
D2' █────┤D2 │ │GATE2├────┘
█ 5│ │ │ │ KPS8OВИ5ЗА
D3' █────┤D3 │ ├─────┤
█ 4│ │ │ │13
D4' █────┤D4 │ │ OUTO├─────────┐
█ 3│ │ │ │17 │
D5' █────┤D5 │ │ OUT1├── │
█ 2│ │ │ │10 │
D6' █────┤D6 │ │ OUT2├── │
█ 1│ │ │ │ │
D7' █────┤D7 │ ├─────┤9 │
█ 19├───┤ │ CLKO├──────┐ │
A5 █────┤A0 │ │ │15 │ │
█ 20│ │ │ CLK1├──────o │
A6 █────┤A1 │ │ │18 │ │
──── █ 21├───┤ │ CLK2├──────o │
CS-53 █────┤CS │ ├─────┤ │ │
── █ 23│ ─ │ │ │24 │ │
WR' █────┤WR │ │ +Ucc├──>+5V│ │
── █ 22│ ─ │ │ │12 │ │
RD' █────┤RD │ │ GND├───┐ │ │
█ └───┴───┴─────┘ ─┴─ │ │
CLK-2 █─────────────────────────o │
2.0 mHz █ 27┌───┬───┬────┐20 │ │
D0' █────┤D0 │PCI│ CLK├───────┘ │
█ 28│ │ │ ─ │9 │
D1' █────┤D1 │ │ TxC├──────────o KPS8OBB51А
█ 1││ │ ─ │25 │
D2' █────┤D2 │ │ RxC├──────────┘ 3┌──┐2
█ 2│ │ ├────┤19 ┌───────┤ >├────>>TxD
D3' █────┤D3 │ │ TxD├─────┘ 5├──┤4
█ 5│ │ │ ─ │24 ┌────┤ >├────>>DTR
D4' █────┤D4 │ │ DTR├────────┘ 7├──┤6
█ 6│ │ │ ─ │23 ┌───┤ >├────>>RTS
D5' █────┤D5 │ │ RTS├─────────┘ └──┘
█ 7│ │ ├────┤3 15┌──┐14 K561 PUČ
D6' █────┤D6 │ │ RXD├───────┤ <├────────o─<+5V │-R3 █ █ █
█ 12│ ─│ │ │4 │100k │ │ │
A5 █────┤C/D│ │ GND├────┐ ┴ ┴ ┴
█ └───┴───┴────┘ ─┴─ │
RESET'█──────────────────────────┘
Possible application of counters with variable coefficient
sharing instead of DPKD on KPS8OVI5Z. It is not obligatory in all cases
feed meander onTxC & RxC inputs of KPS8OBB51 controller;
It is also desirable to limit the clock frequency of LSIs to 2 MHz.
If there are any problems with the programming and operation of KPS8OVI5Z, you can
try to reduce the supply voltage on it to 4.5V (by
serial connection of a diode type KDS22 in the +5V circuit
'forward' direction). When using a branded analogue m/skh
I8253 there is no need to do such modification. Should
Please note that the connecting cable between the computer and RS-232
is a strong emitter of interference to receiving equipment
radio channel in data exchange systems - Packet Radio, RTTY,
AMTOR etc., therefore the cable length should be as short as possible
(no more than 0.5m).
Interface pin assignment:
TxD -"Transmit Data", information output of the transmission block. You-
The TXD stroke is connected to the communication channel (modem input).
DTR -"Data Terminal Ready", terminal readiness. Active
the level (low) of this signal informs external devices
notification about the terminal’s readiness to receive information.
RTS -"Request To Send", transfer request. The active level is
th signal terminalinquires about the possibility of transfer
data to an external device.
RxD -"Receive Data", information input of the receiving block. On
RXD input from the communication channel (modem output) code enters
serial format.
DSR -"Data Send Ready", transmitter readiness. Active level
The level of this signal indicates the readiness of the external device.
swarms to exchange.
CTS -"Clear To Send", transmission resolution. Active level
of this signal, an external device (modem) indicates the
readiness to accept data from the terminal.
to be continued...
Share your thoughts about the article