Manual

KTD-S0051-D Page 22 Serial Interface
KTAM3874/pITX User's Guide
10 Serial Interface
Three serial ports provide asynchronous serial communication with RS-232 interfaces. They are 16C750
UART compatible and support 64 byte FIFO buffers for transfer rates up to 12 Mbps. Following the con-
nector assignment:
J1304 x UART0
J1303 x UART3
J1300 x UART5
10.1 Maximum Transfer Rates
Port RS-232 RS-422 RS-485
UART0 1000 kbps ---- ----
UART3 1000 kbps ---- ----
UART5 400 kbps 12 Mbps 12 Mbps
10.2 Connectors
Two serial ports are available through the connectors J1300 and J1303 (5 pins)
Header Pin Signal Description Type
1 TXD Transmit serial data O
2 RXD Receive serial data I
3 RTS# Request to send O
4 CTS# Clear to send I
5 GND Ground PWR
and the third port through the connector J1304 (3 pins).
Header Pin Signal Description Type
1 TXD Transmit serial data O
2 RXD Receive serial data I
1
3 GND Ground PWR