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| 16 |
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| +15V |
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RS232 |
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| 300 |
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| 300 |
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| DZ13v |
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| DZ13v |
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| 0.1MF |
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| 0.1MF | +5v |
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| U115 |
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| 1 | 8 |
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| +V |
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TRANSMIT | 3 |
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| 7 | DY | DA | 2 |
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RECEIVE | 2 |
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| 5 | RA | RY | 3 |
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GND | 5 |
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| 4 GND RTC 6 |
| DS9 | |||
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| SN75155 |
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| RS485/RS232 |
RS485 |
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| +5v | 0.1MF |
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| 6 |
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| 8 | U114 | 1 |
| 1K | |
T/R- |
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| VCC R |
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7 |
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| 7 | 2 |
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| 120 | * R119 | B | RE |
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| 6 |
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| 3 |
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| 8 ohm |
| 5 | A | DE | 4 |
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T/R+ | 9 |
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| GND D |
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| SN75LS176 |
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TRANSMIT/ | 1 1K |
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RECEIVE CONTROL |
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| * R802 | +5v |
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+5V | 4 |
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Notes:
*R119 - LINE TERMINATION RESISTOR, USED ON BOTH ENDS OF LONG LINES. NORMALLY NOT MOUNTED.
*R802 - SMD RESISTOR. NORMALLY NOT MOUNTED
COMMUNICATION
DBP - Rev 6/93