Eurotech Apollo User Manual page 108

APOLLO user manual
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.
RS422 POINT-TO-POINT
Number of Wires
Transmitters Enabled
Receivers Enabled
BIOS Mode
BIOS Auto Flow Control
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.
108
RS422 MULTI-DROP
5 Number of Wires
always Transmitters Enabled
always Receivers Enabled
RS422 BIOS Mode
Disabled BIOS Auto Flow Control
RS485 MULTI-DROP
5
Number of Wires
active RTS
Transmitters Enabled
always
Receivers Enabled
RS422
BIOS Mode
Enabled
BIOS Auto Flow Control
3
active RTS
always
RS485
Enabled
Issue G