Black Box SW487A-R2 manual Serial-Port Pinout, Signal Description DB9 Pin DB25 Pin

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

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