UNO-1150 User Manual
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2.2 COM1: RS-232 Interfaces
The UNO-1150 offers one standard RS-232 serial communication inter-
face port on COM1. Please refer to A.2 for pin assignments.
2.3 COM2~COM3: RS-232/422/485 Interfaces
The UNO-1150 offers two RS-232/422/485 serial communication inter-
face ports, and they are COM2 and COM3. Both port can be configured
individually to either RS-232, RS422/485 by using on-board jumpers.
Please refer to A.3 for pin assignments and Table 2.1 lists the default set-
ting of each port.
2.3.1 16C954 UARTs with 128-byte standard
Advantech UNO-1150 comes standard with Oxford 16PCI952 UARTs
containing 128 bytes FIFOs. These upgraded FIFOs greatly reduce CPU
overhead and are an ideal choice for heavy multitasking environments.
2.3.2 Jumpless for RS-422/485
In RS-422/485 mode, UNO-1150 automatically sense signals to match
RS-422 or RS-485 network. No need to change jumpers.
2.3.3 Automatic Data Flow Control Function for RS-485
In RS-485 mode, UNO-1150 automatically senses the direction of incom-
ing data and switches its transmission direction accordingly. Therefore no
handshaking signal (e.g. RTS signal) is necessary. This feature lets you
simply and quickly build an RS-485 network with just two wires. More
importantly, application software previously written for half duplex RS-
232 environments can be maintained without need for modification.
Table 2.1: COM2 & COM3 Default Settings
COM Port
Default Setting
COM2
RS-422/485
COM3
RS-422/485
