ADLINK cPCI-3534/3538/3544 Multi Serial Port Card Configuration Complete Solution

It is recommended to only connect the necessary signal lines (TXD, RXD, GND). If hardware flow control is required, connect RTS/CTS.

2. RS-422 full duplex wiring (3534 Port D/3544)

The TXD+/- of the module is connected to the RXD+/- of the slave device, and the RXD+/- of the module is connected to the TXD+/- of the slave device. Shielding layer single ended module side isolation ground. Enabling terminal resistors (module side jumper ON) can improve the quality of long line signals (up to approximately 1200 meters).

3. RS-485 half duplex wiring (3534 Port D/3544)

Connect all devices' D+to D+and D - to D - to form a bus topology. Only enable terminal resistors for devices at both ends of the bus. CPCI-3544 supports automatic direction control (hardware automatically switches between transmitting and receiving states), without the need for software control of RTS, simplifying programming; The Port D of 3534 needs to be set to 485 mode through DIP switch and controlled by RTS signal direction (or use automatic flow control mode, depending on specific driving support).

Common troubleshooting guide

Possible causes and solutions for the fault phenomenon

The system cannot recognize poor contact in the PCI slot of the card or incomplete insertion and unplugging of the card. Check the power supply of the cPCI chassis backplane

COM port number conflict, multiple card switch status settings are the same. Check SW1-1/JP1 of 3534/3538 to ensure one is ON and one is OFF; 3544 Check if the card number is unique

Serial communication garbled baud rate/data bit/stop bit mismatch; Or if the terminal resistor configuration is incorrect, check the parameters at both ends; Check the RS-422/485 terminal jumper

RS-485 can only send but cannot receive. Direction control is not effective (RTS control is required for 3534, automatic for 3544). Check if the software correctly pulls RTS high/low; 3544 Check if the driver is loaded with the automatic flow control module

The isolation port has no output, the isolation power supply has not been established, or the isolation ground has not been connected. Confirm that the external device is grounded together with the isolation ground; Check that the module power supply 5V is normal

Insufficient blue screen IRQ resources or driver conflict check system idle IRQ after multi card installation; Attempt to allocate independent IRQ in BIOS; Update driver version