2
Tech Support:
1-800-260-1312
International:
00-1-952-941-7600
(24 hours)
CRS4Fxxxx-100
Installation
CAUTION:
Wear a grounding device and observe electrostatic discharge
precautions when setting the switches.
Failure to observe this caution could
result in damage to, and subsequent failure of, the media converter.
Set the 6-Position Switch
The 6-position switch is located on the side of the media converter. Use a
small flat-blade screwdriver or a similar device to set the recessed switches.
Refer to the drawing for the locations of the six individual switches.
Switch 1 - 130 ohm resistor on “receive”
up
= Disable.
down
= Enable.
(Switch 5 must also be set to “4-wire” (down).)
When enabled, switch 1 inserts a 130 ohm resistor on the wire pair:
•
Receive (-) (B) RS-485 4-wire, receive (-) RS-422 and
•
Receive (+) (A) RS-485 4-wire, receive (+) RS-422.
Switch 2 - 130 ohm resistor on “transmit”
up
= Disable.
down
= Enable.
(Switch 5 must also be set to “2-wire” (up).)
When enabled, switch 2 inserts a 130 ohm resistor on the wire pair:
•
Transmit/Receive (-) (B) RS-485 2-wire, transmit (-) RS-422 and
•
Transmit/Receive (+) (A) RS-485 2-wire, transmit (+) RS-422.
Switch 3 - 1K ohm “pull-down”
up
= Disable.
down
= Enable.
(Switch 5 must also be set to “2-wire” (up).)
When enabled, switch 3 enables a 1K ohm pull-down on the wire:
•
Transmit/Receive (-) (B) RS-485 2-wire, transmit (+) RS-422.
Switch 4 - 1K ohm “pull-up”
up
= Disable.
down
= Enable.
(Switch 5 must also be set to “2-wire” (up).)
When enabled, switch 4 enables a 1K ohm pull-up on the wire:
•
Transmit/Receive (+) (A) RS-485 2-wire, transmit (+) RS-422.
130 ohm resistor on "transmit"
1K ohm "pull-down"
1K ohm "pull-up"
2-wire / 4-wire
130 ohm resistor on "receive"
RS-485 / RS-422
1 2 3 4 5 6
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3
Installation
-- Continued
Switch 5 - 2-wire / 4-wire
up
= 2-wire.
down
= 4-wire.
Set switch 5 to
2-wire
(up) to enable the wire pair:
•
Transmit/Receive (-) (B) RS-485 2-wire, transmit (-) RS-422 and
•
Transmit/Receive (+) (A) RS-485 2-wire, transmit (+) RS-422.
for RS-422 2-wire, half-duplex operation.
Set switch 5 to
4-wire
(down) to enable the wire pair:
•
Receive (-) (B) RS-485 4-wire, transmit (-) RS-422 and
•
Receive (+) (A) RS-485 4-wire, transmit (+) RS-422.
for RS-422 4-wire, full-duplex operation.
Switch 6 - RS-485 / RS-422
up
= RS-485.
down
= RS-422.
Set switch 6 to
RS-485
(up) to prevent echo in the 2-wire mode.
Set switch 6 to
RS-422
(down) to allow “transmit only” for the wire pair:
•
Transmit/Receive (-) (B) RS-485 2-wire, transmit (-) RS-422 and
•
Transmit/Receive (+) (A) RS-485 2-wire, transmit (+) RS-422.
