2-PORT RS-232/422/485 PCI HOST ADAPTER
Appendix E: Board Layout
| 7201 |
| • JxB JUMPER SETTINGS • |
| U6 |
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| Y1 |
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| RS422 - REMOVE ALL JUMPERS |
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C1 |
| R1 | RS485 - AT= AUTO ENABLE |
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| C10 |
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| RS485 - RT= RTS ENABLE |
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U1 GD75232 | R2 | RS485 - NE= NO ECHO |
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| R29 |
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| J2B |
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| C12 | |||||
C2 | R8 | C4 J1B |
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| R30 | J1C | J2C | |||||||
Port 1 J1 |
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| AT RT NE | AT RT NE |
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| C13 | |||||||||
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| C5 |
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RS232 |
| HEADER24PINW |
| E1 |
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| C11 | DIV1 | DIV2 | DIV4 | DIV1 | DIV2 DIV4 | C14 | |||
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| R16 R20 R24 | ||||||||||||||
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| 1 |
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| Port |
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| Port 1 |
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| Port 2 |
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RS422 |
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| R17 R21 R25 |
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| HEADER24PINW |
| E2 | R18 R22 R26 |
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| E5 |
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| C3 R4 R5 R8 R9 R10 | R11 |
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| R3 R5 R7 |
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| R12U4 75174 |
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| J1A |
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| R13 |
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Port 2 J2 |
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| P P T L L |
| U7 16550 PLCC |
| U9 | 16550 PLCC | ||||||||
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| R14 | C7 |
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| R31 |
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U2 GD75232 |
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| J2A |
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| U4 75175 | R27 |
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| C15 |
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| P P T L L | R15 | R28 |
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| • JxC - CLOCK DIV • | ||||
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| R19 R23 |
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| DIV1= DIVIDE BY 1 | ||
RS232 |
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| HEADER24PINW |
| E3 | C8 |
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| DIV2= DIVIDE BY 2 | |||||
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| PCI9050 |
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| DIV4= DIVIDE BY 4 | |||||||||
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| 2 |
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| PORT1= J1x | ||
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| Port | U5 93CS46 |
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RS422 |
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| PORT2= J2x | ||||
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| HEADER24PINW |
| E4 |
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| C6 |
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| MADE IN USA | ||
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| • JxA JUMPER SETTINGS • | C9 |
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| C16 | C17 | |||
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| P= PULL UP/DOWN ENABLE |
| U8 |
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| T= TERMINATION ENABLE |
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| P1 |
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| L= CONNECT RX TO TX |
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Figure E-1. Board layout.
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