DECISION COMPUTER INTERNATIONAL CO., LTD. 8255/8253 I/O CARD Card Type Data acquisition Chip Set NEC 8255 I/O Options Digital I/O ports (2) Data Bus 8-bit ISA [Image] CONNECTIONS Function Label Function Label Digital I/O port 1 (see CN1 Digital I/O port 2 CN2 pinout below) (see pinout below) CN1 PINOUT Function Pin Function Pin Ground 1 Channel 1C bit 6 21 Ground 2 Channel 1C bit 7 22 Ground 3 Channel 1C bit 4 23 Channel 1A bit 3 4 Channel 1C bit 5 24 Channel 1A bit 1 5 Channel 1C bit 1 25 Channel 1A bit 2 6 Channel 1C bit 0 26 Clock signal 0 in 7 Channel 1B bit 7 27 Channel 1A bit 0 8 Channel 1C bit 2 28 Gate signal 0 9 Channel 1B bit 6 29 Clock signal 0 out 10 Channel 1C bit 3 30 Clock signal 2 out 11 Channel 1B bit 5 31 Clock signal 2 in 12 Channel 1B bit 0 32 Clock signal 1 in 13 Channel 1B bit 4 33 Gate signal 2 14 Channel 1B bit 1 34 Clock signal 1 out 15 Channel 1B bit 3 35 Gate signal 1 16 Channel 1B bit 2 36 Channel 1A bit 5 17 +5V power 37 Channel 1A bit 4 18 -5V power 38 Channel 1A bit 7 19 +12V power 39 Channel 1A bit 6 20 -12V power 40 CN2 PINOUT Function Pin Function Pin Ground 1 Channel 2C bit 7 21 Ground 2 Channel 2C bit 6 22 Ground 3 Channel 2C bit 5 23 Ground 4 Channel 2C bit 4 24 Ground 5 Channel 2C bit 0 25 Ground 6 Channel 2C bit 1 26 Ground 7 Channel 2C bit 2 27 Ground 8 Channel 2B bit 7 28 Ground 9 Channel 2C bit 3 29 Ground 10 Channel 2B bit 6 30 Ground 11 Channel 2B bit 0 31 Ground 12 Channel 2B bit 5 32 Channel 2A bit 0 13 Channel 2B bit 1 33 Channel 2A bit 1 14 Channel 2B bit 4 34 Channel 2A bit 2 15 Channel 2B bit 2 35 Channel 2A bit 3 16 Channel 2B bit 3 36 Channel 2A bit 4 17 +5V power 37 Channel 2A bit 5 18 -5V power 38 Channel 2A bit 6 19 +12V power 39 Channel 2A bit 7 20 -12V power 40 USER CONFIGURABLE SETTINGS Setting Label Position » Counter 0 uses internal clock source JP1/A Closed Counter 0 uses external clock source JP1/A Open » Counter 1 uses internal clock source JP1/B Closed Counter 1 uses external clock source JP1/B Open » Counter 2 uses internal clock source JP1/C Closed Counter 2 uses external clock source JP1/C Open » Base I/O address set to 1B0h JP2 Closed Base I/O address set to 1F0h JP2 Open DIAGNOSTIC LED(S) LED Color Status Condition 1PA0 Red On Channel 1A bit 0 is active 1PA0 Red Off Channel 1A bit 0 is not active 1PA1 Red On Channel 1A bit 1 is active 1PA1 Red Off Channel 1A bit 1 is not active 1PA2 Red On Channel 1A bit 2 is active 1PA2 Red Off Channel 1A bit 2 is not active 1PA3 Red On Channel 1A bit 3 is active 1PA3 Red Off Channel 1A bit 3 is not active 1PA4 Red On Channel 1A bit 4 is active 1PA4 Red Off Channel 1A bit 4 is not active 1PA5 Red On Channel 1A bit 5 is active 1PA5 Red Off Channel 1A bit 5 is not active 1PA6 Red On Channel 1A bit 6 is active 1PA6 Red Off Channel 1A bit 6 is not active 1PA7 Red On Channel 1A bit 7 is active 1PA7 Red Off Channel 1A bit 7 is not active 2PA0 Red On Channel 2A bit 0 is active 2PA0 Red Off Channel 2A bit 0 is not active 2PA1 Red On Channel 2A bit 1 is active 2PA1 Red Off Channel 2A bit 1 is not active 2PA2 Red On Channel 2A bit 2 is active 2PA2 Red Off Channel 2A bit 2 is not active 2PA3 Red On Channel 2A bit 3 is active 2PA3 Red Off Channel 2A bit 3 is not active 2PA4 Red On Channel 2A bit 4 is active 2PA4 Red Off Channel 2A bit 4 is not active 2PA5 Red On Channel 2A bit 5 is active 2PA5 Red Off Channel 2A bit 5 is not active 2PA6 Red On Channel 2A bit 6 is active 2PA6 Red Off Channel 2A bit 6 is not active 2PA7 Red On Channel 2A bit 7 is active 2PA7 Red Off Channel 2A bit 7 is not active