Solvline PCI - Manual (Page 55)

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Multi-2C/LPCI VA3
c. Slew: Slew Rate Limit Ability
10M: Not use Slew Rate Limit ability. Maximum communication speed
921.6Kbps in this mode.
250K: Use Slew Rate Limit ability. Communication speed is limited under
250Kbps.
Slew Rate Limit reduces reflected waves emitting from ends of
communication cables and speeds up slew-rate driver that restrains EMP
electromagnetic waves thereby enabling communication with no data errors.
But communication speed is limited in this mode
3. RS422 Point-to-Point Connection