11
Chapter 2
2.2 RS-232/422/485 Interface (COM1~COM2)
The UNO-3072LA offers two industrial RS-232/422/485 serial commu-
nication interface ports: COM1 and COM2. Please refer to Appendix A.4
for their pin assignments. The default setting of COM1 and COM2 are
RS-422/485. (Please refer to section 2.2.4 for how to determine RS-232
or RS-422/485)
2.2.1 16C950 UARTs with 16-byte FIFO Standard
Advantech UNO-3072LA comes standard with Oxford 16PCI952 UART
(two OX16C950 UARTs, fully software compatible with 16C550) which
containing 128 bytes FIFOs. These upgraded FIFOs greatly reduce CPU
overhead and are an ideal choice for heavy multitasking environments.
2.2.2 RS-422/485 Jumperless Detection
In RS-422/485 mode, UNO-3072LA automatically detects signals to
match RS-422 or RS-485 networks. (Refer to section 2.2.5)
2.2.3 Automatic Data Flow Control Function for RS-485
In RS-485 mode, UNO-3072LA automatically detects the direction of
incoming data and switches its transmission direction accordingly. So no
handshaking signal (e.g. RTS signal) is necessary. This lets you easily
build an RS-485 network with Data+, Data- and Ground. More impor-
tantly, application software previously written for full-duplex RS-232
environments can be maintained without modification.
2.2.4 RS-232/422/485 Selection
COM1 and COM2 support 9-wire RS-232, RS-422 and RS-485 interfaces.
The system detects RS-422 or RS-485 signals automatically in RS-422/
485 modes. To select between RS-422/485 and RS-232 for COM1, adjust
CN28. To select between RS-422/485 and RS-232 for COM2, adjust
CN29.
You can refer to figures below to set the CN28 and CN29.
Note:
Please refer to Appendix A.2 Figure A.2 for location
of CN28 and CN29 location.
Summary of Contents for UNO-3072LA
Page 1: ...i UNO 3072LA Intel Atom Embedded Automation Computer with Two PCI Slot Extensions User Manual ...
Page 9: ...ix Table of Contents ...
Page 10: ...UNO 3072LA User Manual x ...
Page 15: ...5 Chapter 1 1 4 Chassis Dimensions Figure 1 1 Chassis Dimensions 177 00 238 00 139 60 ...
Page 17: ...7 Chapter 1 ...
Page 18: ...UNO 3072LA User Manual 8 ...
Page 37: ...27 Chapter 3 7 Re fasten the upper cover with the six screws ...
Page 39: ...29 Chapter 3 5 Plug in PCI bus card in a PCI slot of UNO 3072LA ...
Page 45: ...APPENDIX A System Settings and Pin Assignments ...
Page 60: ...UNO 3072LA User Manual 50 ...
Page 61: ...APPENDIX B Programming the Watchdog Timer ...
Page 64: ...UNO 3072LA User Manual 54 ...