Table 6:
Application serial port configuration
Parameter
Value
Baud rate
300...460800 bps
Data bits
8
Parity
No parity
Stop bits
1
Flow control
CTS/RTS
By default, all DIP switches are set to the 0 position (RS-232 mode). DIP switches
2...4 apply only when DIP switch 1 is set to differential mode (RS-485/RS-422).
Table 7:
DIP switches
DIP switch
Mode
State
Description
1
RS-232 or differential
0 = RS-232, 1 =
RS-485 and RS-422
Selects the serial port
operation mode
2
DUPLEX
0 = FULL, 1 = HALF
Selects between
RS-422 full-duplex (4-
wire) and RS-485 half-
duplex (2-wire)
differential modes
3
BIASING
0 = OFF, 1 = ON
Enables RS-422
biasing on pins 2 and
8
4
TERMINATION
0 = OFF, 1 = ON
Enables RS-422
termination on pins 2
and 8
If biasing and/or termination is required for the RS-485 half-duplex
(2-wire) mode, enable RS-422 biasing/termination with DIP
switches and manually connect pins 2-7 and 3-8 together at the
application port (RS-2).
Do not connect RS-422 or RS-485 cables to a serial port configured
to the RS-232 mode. This could damage the port and the connected
equipment.
Table 8:
Application serial port pinouts in RS-422/485 modes
PIN
RS-422 full-duplex (4-wire)
RS-485 half-duplex (2-wire)
1
-
-
2
RXD positive (in)
-
3
TXD negative (out)
TXD/RXD negative (out/in)
4
-
-
5
GND
GND
Table continues on next page
1MRS758458 F
Section 3
Physical connections
ARR600
17
User Manual
