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USER PORT STD. DTE OPT. DCE
CABLE CABLE
| +------\ | |
| 2 | \ 3 | |
M -|------------------| U1-A O-------|- 2 TX ----------|- 3 RX
| | / | |
| +------/ | |
| \ | |
| | \ | |
| 3| \ 4 4+------\ | |
D -|---|U3-B O----+---| \ 6 | |
| | / | 5| U1-B O-------|- 4 RTS ----------|- 5 CTS
| | / +---| / | |
| / +------/ | |
| | |
| \ | |
| | \ | |
| 5| \ 6 9+------\ | |
E -|---|U3-C O----+---| \ 8 | |
| | / | 10| U1-C O-------|- 20 DTR ------+---|- 6 DSR
| | / +---| / | | |
| / +------/ | | |
| | | |
| | | |
| / | | |
B -|---+ / | | | |
| | 3 / | 1 | | |
C -|-----------------O U2-A -----------|- 3 RX ------|---|- 2 TX
| \ | | | |
| \ | | | |
| \ | | |
| | | |
| | | |
| | | |
| / / | | |
| / | / | | | |
| 10 / |11 6 / | 4 | | |
L -|----O U3-E ------O U2-B -----------|- 6 DSR ---+ +---|- 8 DCD
| \ | \ | | | |
| \ | \ | | | |
| \ \ | | |
| | | |
| | | |
| / / | | |
| / | / | | | |
| 12 / |13 8 / | 10 | | |
K -|----O U3-F ------O U2-C -----------|- 5 CTS ---|------|- 4 RTS
| \ | \ | | | |
| \ | \ | | | |
| \ \ | | |
| | | |
| | | |
| / / | | |
| / | / | | | |
| 8 / | 9 11 / | 13 | | |
H -|----O U3-D ------O U2-D -----------|- 8 DCD ---+------|- 20 DTR
| \ | \ | | |
| \ | \ | | |
| \ \ | |
| | |
| | |
N -|-----------------------------------|- 7 SIG GND ----------|- 7
| | |
| +5V | |
2 -|----+------------+ +------|- 1 PROTECTIVE GND --------|- 1
| | | | | |
| | | | | |
| --+-- 0.1uF | ------- | |
| --+-- 10V | --- | |
| | | - | *********************************
A -|----+ | | * *
| | | | * U-1 1488 RS-232 XMTR *
| ------- | 14 +----+ 7 | * *
| --- +----| U2 |--+ | * U-2 1489 RS-232 RCVR *
| - | +----+ \ | * *
| | \ | * U-3 7404 HEX INVERTER *
| | 14 +----+ 7\ | * *
| +----| U3 |--+ | * DIODES SIGNAL DIODES *
| |\ | +----+ | | * WILL WORK HERE *
| | \| | | * *
10-|----| |---+--------+ | | * NOTE: THE RS-232 VOLTAGE *
| | /| + | | ------- | * BE APPX +/- 10 VOLTS *
| |/ | --+-- | --- | * WHICH IS OK TO USE *
| 100uF --+-- 14 | - | * PER RS-232 STANDARD *
| 15V | +--|--+ | * *
| | | | 7 | * *
| ------- | U1 +----+ | *********************************
| --- | | | |
| - +--|--+ | |
| 1 | ------- |
| | --- |
| 120uF | - |
| 15V | /| | | *********************************
| +|| |/ | | | * *
11-|--||----+---| |----+----+ | * Commodore User Port to RS-232 *
| || | |\ | | | * Adaptor designed by Stephen *
| | | \| | | * Coan, Version 2, 03-NOV-83. *
| | | | * *
| -------- 100uF ---+--- | * This general design has also *
| \ / 15V ---+--- | * been used in other devices *
| \/ + | | * where a negative voltage was *
| -------- | | * not available for the RS-232 *
| | | | * *
| | | | * NOTE: The DTE is usually a *
| +-------+----------+ | * male pin DB-25 connector and *
| | | * the DCE is usually a female *
| | | * DB-25 connector. Overlay the *
| ------- | * DCE over the DTE to see the *
--- | * connection scheme for DCE *
- | * usage. *
| * *
| *********************************
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