DB50M
Figure 1-1: 422 Block Diagram(Only one serial channel shown)
TRANSCEIVER
AUTO RTS
CIRCUITRY
OSCILLATOR
PCI
INTERFACE
CHIP
UART
16550
OR
SIMILAR
OPTO-
ISOLATOR
DEVICES
COMPUTER PCI BUS
DB37
Tx/Rx+
Tx Tx
Rx Rx
Tx/Rx-
IRQ
Figure 1-2: 485 Block Diagram
Manual PCI-ICM-422(485)/2(4)
8
