User manual
Table Of Contents
- Chapter 1 Overview
- Chapter 2 Hardware Functionality
- 2.1 Introduction
- 2.2 RS-232/422/485 Interface (COM1~COM2)
- 2.3 Optional RS-232 Interfaces (COM3~COM4)
- 2.4 LAN: Ethernet Connector
- 2.5 Power Inputs
- 2.6 USB Connector
- 2.7 DVI-I Display Connector
- 2.8 Reset Button
- 2.9 Power Button
- 2.10 Audio
- Chapter 3 Initial Setup
- Appendix A System Settings and Pin Assignments
- A.1 System I/O Address and Interrupt Assignments
- A.2 Board Connectors and Jumpers
- A.3 RS-232 Standard Serial Port (COM3~COM4)
- A.4 RS-232/422/485 Serial Port (COM1~COM2)
- A.5 Ethernet RJ-45 Connector (LAN1~LAN2)
- A.7 PS/2 Keyboard and Mouse Connector
- A.8 USB Connector (USB1~USB4 & CN7)
- A.9 VGA Display Connector
- Appendix B Programming the Watchdog Timer
UNO-3072LA User Manual 12
2.2.6 RS-485 Auto Flow/RS-422 Master/Slave Selection
UNO-3072LA support "Auto Flow Control" mode of RS-485 in default
without any setting or jumper required. In RS-485, the driver automati-
cally senses the direction of the data flow and switches the direction of
transmission. Then no handshaking is necessary.
UNO-3072LA can also allow user to adjust "Master/Slave" mode of RS-
422 by changing setting in BIOS for each RS-422/485 port COM1 &
COM2.
1. Boot up the system or reset the system, while boot up, press "Del"
to enter into BIOS.
2. Select "Integrated Peripherals ' Onboard Device ' COM1 RS-422
or COM2 RS-422
3. The default of RS-422 is "Slave". User can change to "Master" for
RS-422 Master Device requirement.
4. Press F10 or Back to "Save and Exit Setup" to finish setup change.
In RS-422, if the device mode was set to "Master", the driver is always
enabled, and always in high or low status.