Features

• 144 DIO High density on ACL-7122
• 48 DIO with timer on PET-48DIO
• 24 DIO on ACL-7124 for low cost 
• TTL/DTL compatible digital I/O channels
• Direct interface with OPTO-22 compatible I/O modules Emulates industry standard 8255 PPI (mode 0)
• Buffered circuits for high drive capacity
• Output status readback
• Programmable interrupt handling
• PC/AT bus with 11 IRQ levels
• Compact size, SMT components

Specifications

Digital I/O

• I/O channels: 
• ACL-7122: 144 DIO channels
• PET-48DIO: 48 DIO channels
• ACL-7124: 24 DIO channels
• I/O characteristics: TTL/DTL Compatible
• Data transfer: Programmed I/O, Interrupt

• Counter Chip: 85C53 or equivalent
• Counter frequency: DC to 2MHz
• Counter range" 16 bit down counter
• Trigger edge" Rising or falling edge, programmable

Programmable Timer Pacer (PET-48DIO only)

• Timer clock: on board 32.768 kHz or 2 MHz
• Frequency divider: Programmable
• Timer resolution: 32 bits (two 16 bit counters cascaded)

Interrupt Control

• Available IRQ levels: (jumper selectable)
• ACL-7122:11 IRQ levels 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15
• PET-48DIO: 9 IRQ levels 3, 4, 5, 7, 9, 10, 11, 12, 15
• ACL-7124: IRQ 2, 3, 4, 5, 6, 7 
• IRQ sources: (Programmable)
• ACL-7122: DIO Port C0, C3, C4
• PET-48DIO: DIO Port C3, C7 or timer 
• ACL-7124: DIO Port C0, C4

• Operating temperature: 0° ~ 55°C
• Storage temperature: -20° ~ 80°C
• Humidity:5% ~95% non-condensing
• Power consumption (without external devices):

ACL-7122
• 1.40 A @ 5VDC (Typical)
• 1.80 A @ 5VDC (Maximum)
PET-48DIO
• 720mA @ 5VDC (Typical)
• 860mA @ 5VDC (Maximum)
ACL-7124
• 380mA @ 5VDC (Typical)
• 450mA @ 5VDC (Maximum)
• Transfer rate: 500 K bytes/sec 
• PCB size:
• ACL-7122: 183 mm x 119 mm
• PET-48DIO: 170 mm x 121 mm
• ACL-7124: 108 mm x 107 mm
• I/O connector: 50-pin male ribbon connector
  

• TB-24P 
• TB-24R 
• TB-16P8R 
• TB-24
• DIN-24R 
• DIN-24P
• DIN-50P 
• DIN-24G 

Ordering Information

• ACL-7122
144-bit Digital I/O Card
• PET-48DIO
Programmable 48-bit DIO, Event, and Timer Card
• ACL-7124
24-bit Digital I/O Card