Serial port, Confidential – Epson SR-600 User Manual
Page 156
Appendix 1-2
Interfaces
Rev.A
Confidential
Serial Port
SR-600
has three NS16550 compatible serial ports and three external connectors. These
connectors can be used for COM1, COM2 and COM3. Optional devices can be connected to the
external connectors. External serial port connector is a 9-pin D-Sub male type. Assignments of
serial connector signals are shown below.
A1-3 Serial Port Connector
(*) COM1 and COM2 can generate 5V output to no. 1 pin by setting the BIOS.
Table A1-1 Serial port pin assignments()IO board CN5/6/7)
No.
Signal name
I/O
Description
1
DCD/Power
supply (*)
I/--
Carrier detectin signal or power
supply output
2
RXD
I
Received data signal
3
TXD
O
Transmisson data signal
4
DTR
O
Terminal ready signal
5
GND
--
Ground
6
DSR
I
Data set ready signal
7
RTS
O
Transmission request signal
8
CTS
I
Transmission data cleared signal
9
RI
I
Ring signal
1
5
6
9