CHAPTER 5: Conversions and Connections
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04 | 2B | 46 | 58 | 71 | 8D | AB | B7 | CE | ED |
08 | 30 | 47 | 59 | 72 | 8E | AC | B8 | CF | EF |
09 | 31 | 48 | 62 | 73 | 8F | AE | B9 | DA | FA |
17 | 34 | 49 | 63 | 74 | 90 | AF | BA | DB | FB |
1A | 38 | 51 | 64 | 75 | 9A | B0 | BB | DC | FC |
20 | 3B | 52 | 65 | 76 | 9C | B1 | BC | DD | FD |
21 | 3E | 53 | 66 | 77 | 9D | B2 | BE | DE | FE |
23 | 42 | 54 | 67 | 78 | 9E | B3 | BF | DF | FF |
24 | 43 | 55 | 68 | 80 | 9F | B4 | CB | EA |
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28 | 44 | 56 | 69 | 8A | A0 | B5 | CC | EB |
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2A | 45 | 57 | 70 | 8C | AA | B6 | CD | EC |
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5.5 PRINTED CIRCUIT BOARD LAYOUT
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| P1 | EARTH |
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SW4 | RESET | OPT | GND | 11VAC | C. T. | 11VAC |
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| DSR |
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| PORT A | DB25 |
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| U27 |
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| U28 | |||
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| DTR A | |
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| U22 |
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| U23 |
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| CNT |
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| CTS A | ON CNT | CARR B | ON | CAR B |
| ENB | CD |
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| XTAL |
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| U18 | ON CNT |
| U19 |
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| A CARR | CNT |
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| U16 |
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| U12 |
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| U9 |
| 64 |
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| R1 |
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| 28 |
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| EPROM |
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| U7 |
| DSR B |
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| U8 |
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| DSR A |
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| TXD A | RXD A | RTS A | CTS A | DTR A | DSR A | CDA A | CDB |
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| TXD B |
| RXD B | |||
DTR |
| PORT B | DB25 |
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| SME B | U29 | U30 |
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U24 | SME B | EXT B | U25 | EXT | U26 | CNT ON | DTR B |
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| CTS CNT B | ON |
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| 8 |
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U20 | CAR A ENB |
| U21 |
| ON | 1 | SW1 |
DETECT | CDB |
| U17 |
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| 8 | SW2 |
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| ON | 1 |
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DETECT | CDA |
| U13 |
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| 8 | SW3 |
6264 |
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| ON | 1 |
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6116 |
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RTS B | CTS B | DTR B | DSR B | TXC B | RXC B | PWR |
Figure 5-2. Printed Board Circuit Layout.
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