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Chapter 3: Motherboard Connections
3.2 Headers and Connectors
Fan Header
There is one fan header with 4-pins on the motherboard. Pins 1-3 are backward compatible
with traditional 3-pin fans. The onboard fan speeds are controlled by Thermal Management
(via Hardware Monitoring) in the BIOS. When using Thermal Management setting, please
use all 3-pin fans or all 4-pin fans.
Fan Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
COM Header
The motherboard has three COM headers that provide six COM connections. COM1/2 from
JCOM1 supports RS232/422/485. COM3/4/5/6 from JCOM2/3 supports RS232 only. The
manufacturer of the header is ACES Electronics, MPN 50419-02001. The mapping plug
header for cable assembly is 50420-020HKH0-001.
COM Port Pin Definitions
(JCOM1)
Pin#
RS-232
RS-422/485
Full Duplex
RS-485
Half Duplex
1
SP_DCD1 TX-1
Data-1
2
SP_RXD1 TX+1
Data+1
3
SP_TXD1 RX+1
4
SP_DTR1 RX-1
5
GND
6
SP_DSR1
7
SP_RTS1
8
SP_CTS1
9
SP_RI1
10
NC
11
SP_DCD2 TX-2
Data-2
12
SP_RXD2 TX+2
Data+2
13
SP_TXD2 RX+2
14
SP_DTR2 RX-2
15
GND
16
SP_DSR2
17
SP_RTS2
18
SP_CTS2
19
SP_RI2
20
NC
COM Port
Pin Definitions (JCOM2)
Pin#
RS-232
Pin#
RS-232
1
SP_DCD3
11
SP_DCD4
2
SP_RXD3
12
SP_RXD4
3
SP_TXD3
13
SP_TXD4
4
SP_DTR3
14
SP_DTR4
5
GND
15
GND
6
SP_DSR3
16
SP_DSR4
7
SP_RTS3
17
SP_RTS4
8
SP_CTS3
18
SP_CTS4
9
SP_RI3
19
SP_RI4
10
NC
20
NC
COM Port
Pin Definitions (JCOM3)
Pin#
RS-232
Pin#
RS-232
1
SP_DCD5
11
SP_DCD6
2
SP_RXD5
12
SP_RXD6
3
SP_TXD5
13
SP_TXD6
4
SP_DTR5
14
SP_DTR6
5
GND
15
GND
6
SP_DSR5
16
SP_DSR6
7
SP_RTS5
17
SP_RTS6
8
SP_CTS5
18
SP_CTS6
9
SP_RI5
19
SP_RI6
10
NC
20
NC
