30
RS-232↔485/422 CONVERTERS
Quick Reference:
User-Selectable Options
Use this list as a quick-reference guide when you need to change the jumper
settings.
An asterisk (*) designates the factory-preset jumper settings.
XW1A DCE*
XW1B DTE
W8 A-B* 4-wire
B-C 2-wire
W15 A-B* RTS/CD enabled
B-C Data enabled (Maximum speed is 64K.)
W5 A-B* RTS/CTS* delay (normal)
B-C RTS/CTS/CD delay (CTS inhibited if CD
is present when RTS is raised.)
W9 RTS/CTS delay (The time before the RS-485 driver is enabled and
CTS is asserted after RTS is asserted. The RS-485 driver is always enabled.)
A 30 msec
B 10 msec
C* 0 msec
DON
W17 When W15 is in the B-C (Data Enabled) position, this is the time
the RS-485 driver remains enabled after a low-to-high transition on the
DATA line to prevent disabling the driver in the middle of a character.
A 70 msec
B* 7 msec
C 2 msec
D 0.7 msec
E 0.15 msec
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