APOLLO user manual
Issue G
108
RS485/422 interface configuration
The following table lists the different RS422/RS485 operating modes supported by the
APOLLO and the BIOS configurations required to support these operating modes.
Termination resistors are often required on the first and last devices of an RS422/RS485
bus. Jumper JP3 is used to enable/disable the RS485/422 termination resistors; see
page 28
for details.
RS485 MULTI-DROP RS422 POINT-TO-POINT RS422 MULTI-DROP
Number of Wires 5
Transmitters Enabled always
Receivers Enabled always
BIOS Mode RS422
BIOS Auto Flow Control Disabled
Number of Wires 5
Transmitters Enabled active RTS
Receivers Enabled always
BIOS Mode RS422
BIOS Auto Flow Control Enabled
Number of Wires 3
Transmitters Enabled active RTS
Receivers Enabled always
BIOS Mode RS485
BIOS Auto Flow Control Enabled
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