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I/O Connectors and Signals
3-7
Operation
3.3.2 J9: Serial1 RS-232 Connector
This connector is available for use with the second UART in the MSC1211.
Only the TD and RD lines are used. The DTR pin is connected to the DSR
pin, and the RTS pin is connected to the CTS pin.
In the RS-232 electrical specification, –5V to –15V on a line indicates a log-
ic high (mark), and +5V to +15V indicates logic low (space). Line states are
described here according to their logical states.
Signal descriptions are described in Table 3–5.
Table 3–5.J8: RS-232 Port Pinout
Pin
Number
Signal
Name
RS-232
Name
Direction
(at board)
Function
1 DCD Data Carrier Detect Output None
2 RD Receive Data Output Serial data output to the host PC
3 TD Transmit Data Input Serial data input from the host PC
4 DTR Data Terminal Ready Input Connected to DSR
5 SG Signal Ground Power Ground reference
6 DSR Data Set Ready Output Connected to DTR
7 RTS Request To Send Input Connected to CTS
8 CTS Clear To Send Output Connected to RTS
9 RI Ring Indicator Output None