
Section 2 Getting Started
2.19
Table 2-2. RS-232 Serial Port Pin Connections
Pin Description
Input/Output
1 No connection
2 Receive data (
RxD-
) Input
3 Transmit data (
TxD-
) Output
4 No connection
5 Ground
6 No connection
7 Request to send (
RTS+
) Output
or 16 x baud clock Output
8 Clear to send (
CTS+
) Input
or 16 x baud clock Input
9 No connection
Table 2-3. RS-422 Serial Port Pin Connections
Pin Description
Input/Output
1 Ground
2 Clear to send positive (
CTS +
) Input
or 16 x baud clock Input
3 Clear to send negative (
CTS -
) Input
or 16 x baud clock Input
4 Transmit data positive (
TxD +
) Output
5 Transmit data negative (
TxD -
) Output
6 Request to send positive (
RTS +
) Output
or 16 x baud clock Output
7 Request to send negative (
RTS -
) Output
or 16 x baud clock Output
8 Receive data positive (
RxD +
) Input
9 Receive data negative (
RxD -
) Input
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