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13.3
R S-485 Connector
6 9 B
You can use Connector X17 (COM D) for RS422/485 purposes.
Header
Pin
Signal Name
1
485_1RXD+
2
485_1RXD-
3
4
485_1TXD+
5
485_1TXD-
The serial port COM D can only be used either as RS232 (Connector X21) or as RS422/RS485 (Connector
X17).
13.4
C onfiguration
7 0 B
From the BIOS set-up utility, you can set the serial input/output interfaces to enabled, disabled or auto.
The base I/O-addresses 3F8h, 2F8h, 3E8h, or 2E8h can be configured when enabled, as well as the
interrupts IRQ3, IRQ4, IRQ10 and IRQ11. COM D can be set to the RS232 or RS485 interface. Refer to the
I/O Device Configuration submenu in the Appendix B: BIOS Operation chapter for information on
configuration.
13.4.1
R S-485 Diagram
1 3 9 B
RS422 (full duplex): Ux and Uy activ
/DTR4
enable signal from BIOS setup
232_485E
5
232_485E
7
GND
SIN4
1
REA#
2
/RTS4
3
SOUT4
4
1
2
VCC
232_485E
3
SOUT4
4
for inform ations about MAX483 pls. refer www.m axim -ic.com
Kontron User's Guide
coolMonster/PM
Channel A positive terminal
Channel A negative terminal
GND
Channel B positive terminal
Channel B negative terminal
U41A
U19A
U74LS125
VCC
2
3
U4F
U11C
U74HCT14
6
232_BEN
U42
U21
VCC
8
RO
VCC
7
485_1RXD-
/RE
B
6
485_1RXD+
DE
A
5
DI
GND
GND
UMAX483
U43
VCC
U22
8
RO
VCC
7
485_1TXD-
/RE
B
6
485_1TXD+
DE
A
5
DI
GND
GND
UMAX483
RS485 (half duplex): Ux activ
RS422 (full duplex): Ux and Uy activ
13 12BSerial-Communication Interfaces
Function
Ground
REA#
RN89
RN7
1
8
2
7
232_485E
3
6
4
5
RN4K7VF
R216
R108
R5%120RS03
R218
R110
GND
R5%240RS03
R217
R109
R5%120RS03
R219
R111
VCC
R5%240RS03
34
VCC
VCC
VCC
RS485/RS422
X17
X18
485_1RXD+
1
485_1RXD-
2
GND
3
485_1TXD+
4
485_1TXD-
5
XSTJST
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