Oxpcie958 Uarts With 128 Bytes Fifo; Rs-422/485 Detection; Automatic Data Flow Control Function For Rs-485; Terminal Resistor For Rs-485 - Advantech ECU-4784 Series User Manual

2.5.1

OxPCIe958 UARTs with 128 bytes FIFO

Advantech ECU-4784 Series comes with Oxford OxPCIe958 UARTs containing 128
bytes FIFO.
2.5.2

RS-422/485 Detection

In RS-422/485 mode, ECU-4784 Series automatically detects signals to match
RS-422 or RS-485 networks. (No jumper change required)
2.5.3

Automatic Data Flow Control Function for RS-485

In RS-485 mode, the ECU-4784 Series automatically detects the direction of incom-
ing data. So no handshake signal (e.g. RTS signal) is necessary. This lets you conve-
niently build an RS-485 network with just two wires.
2.5.4

Terminal Resistor for RS-485

The onboard termination resistor (120 ohm/300 ohm) for COM3~COM18 can be
used for long distance transmission or device matching. (Default Open.) Please refer
to Table 2.8 for the mapping table of Jumper and COM port.
2.5.4.1 COM (3~10) RS-485 terminal resistor setting instructions
Table 2.12: Jumper Setting of Terminal Resistor (For COM (3~10))
CNx
CN27
CN28
CN29
CN30
CN31
CN32
CN33
CN34
ECU-4784 User Manual
Description
2 4 6
Add 120 ohm terminal resistor on TX+/TX- of RS-485
1 3 5
2 4 6
Add 300 ohm terminal resistor on TX+/TX- of RS-485
1 3 5
2 4 6
Add 120 ohm terminal resistor on Rx+/Rx- of RS-422
(optional)
1 3 5
2 4 6
Add 300 ohm terminal resistor on Rx+/Rx- of RS-422
(optional)
1 3 5
18