Dataforth SCM9B-A2000 Series User Manual - Page 8
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SCM9B-A1000 & SCM9B-A2000 USERS MANUAL 8
switch is labelled +1K, -1K and 220. Set the appropriate switch to the
"up" position to enable a resistor.
NOTE: The RS-485 IN +1K and -1K switches should be "up" when the
SCM9B-A1000 is used as a RS-232/RS-485 converter.
SCM9B-A2000 RS-485 TERMINATIONS
Proper biasing and termination resistors in the SCM9B-A2000 may be
enabled by using the internal jumpers contained in the SCM9B-A2000.
Figure 3 shows the location of the jumpers on the SCM9B-A2000 printed
circuit board. The jumpers are shown in the factory setting to enable a
resistor, insert a jumper into the jack position adjacent to the resistor
nomenclature written on the SCM9B-A2000 printed circuit board.
NOTE: The RS-485 IN +1K and -1K jumpers should be installed when
the SCM9B-A2000 is used as a RS-232/RS-485 converter.
FACTORY RS-485 TERMINATION SETTINGS
SCM9B-A1000: 300 BAUD, +1K, -1K on RS-485 IN & RS-485 OUT
connectors enabled, all other switches off.
SCM9B-A2000: 300 BAUD, +1K, -1K, on RS-485 IN & RS-485 OUT
enabled via internal jumpers, all other termination jumpers disabled.
Figure 3. SCM9B-A2000 jumper locations.