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AIMB-786 User Manual
Chapter 1
H
ardware
C
onfiguration
1.8.7
COM3 RS-232/422/485 jumper setting (JSETCOM3)
Use JSETCOM3 to select the RS-232/422/485 mode for COM3. The default setting
is RS-232. While RS-485 is selected, change device mode to RS-485 for further
choice of auto flow control under BIOS menu is necessary. Please refer to Chapter
3.2.2.10.
1.8.8
COM3 RS-422/485 termination resistor (JT1, JR1)
To stabilize communications, JT1 and JR1 allow to enable or disable 120 ohm of ter-
mination resistor at board side for COM3 RS-422/485 mode to match impedance,
depending on user’s device application. JT1 is for TX signal line; JR1 is for RX signal
line.
Table 1.8: COM3 RS-232/422/485 jumper setting (JSETCOM3)
Function
Setting
*RS-232
RS-422
RS-485
*default
Table 1.9: COM3 RS-422/485 termination resistor (JT1, JR1)
Function
Jumper Setting
Disable termination
1-2 closed
*Enable termination
2-3 closed
* default
1
2
3
1
2
3
Summary of Contents for AIMB-786
Page 6: ...AIMB 786 User Manual vi...
Page 12: ...AIMB 786 User Manual xii...
Page 13: ...Chapter 1 1 Hardware Configuration...
Page 25: ...Chapter 2 2 Connecting Peripherals...
Page 38: ...AIMB 786 User Manual 26 2 21 SMBus Connector SMBUS1 SMBus1...
Page 39: ...Chapter 3 3 BIOS Operation...
Page 82: ...AIMB 786 User Manual 70...
Page 83: ...Chapter 4 4 Chipset Software Installation Utility...
Page 85: ...Chapter 5 5 Integrated Graphic Device Setup...
Page 87: ...Chapter 6 6 Intel ME...
Page 89: ...Chapter 7 7 LAN Configuration...
Page 91: ...Chapter 8 8 SATA RAID Setup...
Page 93: ...Chapter 9 9 HD Audio...
Page 95: ...Appendix A A Programming the Watchdog Timer...
Page 103: ...Appendix B B I O Pin Assignments...
Page 115: ...103 AIMB 786 User Manual Appendix B I O Pin Assignments...