DSA00391241.pdf
by Acrosser

Partial File Text Isolated 422/485 Communication Card AR-B9012 Features 2 serial 16C550 ports (16C550 w/16 byte FIFO for option) Interface type: RS-422A or RS-485 Baud Rate: up to 115.2K bps Can be set from COM
Datasheet Type Original

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120 OHM RESISTOR can bus 16c550 16c550 datasheet AR-B9012 PC900 RS-422A SN75172 SN75173 SN75174 SN75175 TXD RXD uart 16c550