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CHAPTER 5: Configuration and Operation
5.5 Serial-Port Pinout
The 6 x 4 Electronic SCSI Switch has two RS-232 serial ports, using female DB9
connectors, which allow external control of the switch. The connectors are
compatible with standard RS-232 modem cables. The serial ports can be
configured to operate separate communications ports or as daisychained ports.
Daisychained mode allows one computer or terminal to communicate with
multiple 6 x 4 Electronic SCSI Switches.
Table 5-3. Rear-panel RS-232 connector pinout.
Signal Description DB9 Pin DB25 Pin
DCD Data Carrier Detect 1 8
RXD Receive Data 2 3
TXD Transmit Data 3 2
DTR Data Terminal Ready 4 20
GND Signal Ground 5 7
DSR Data Set Ready 6 6
RTS Request to Send 7 4
CTS Clear to Send 8 5
RI Ring Indicator 9 22