4DP7APXDH222
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Data Hiway DMA
Hiway DMA card for cable lengths up to 5000ft, processes read and write commands through DMA, and is the card where the box address is set.
This board contains 2 LEDS:
Upper LED – On or blinks for callups to this box
Lower LED – On or blinks for data read/write
Board contains 2 sets of Switch Packs for Polling adjustment(S2,S3) and 1 set for Addressing(S1).
Address Switch Pack _ _ _ _ _ _ _ _ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |_| |_| |_| |_| |_| |_| |_| |_| P S B 16 8 4 2 1 | | | | | | | | |__ BA + 32, PIU expansion bit | | 'Set' for PIU with 3 or 4 PCFA's | | 'Reset' for PIU with 1 or 2 PCFA's | | | |________ Spare, always 'Reset'(0) | |______________ POLL, normally 'Reset' only 'Set' to force PIU to respond to all Hiway polls during adjustment of poll delay time. Reset when adjust is complete. Poll Adjust Switch Pack _ _ _ _ _ _ _ _ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Delay|_| |_| |_| |_| |_| ? |_| |_| |_| ?sec 16 8 4 2 1 1/2 1/4 1/8