Black Box SC120A-R2 User Manual download pdf (Page 27)

2 X 2 SCSI MATRIX SWITCH

Table 5-2. Jumper settings for external termination.

SC120A-R2 SC121A

E6-Port A E22-Port 1 E19-Port A E17-Port 1

E5-Port B E21-Port 2 E20-Port B E18-Port 2

NOTE

The standard factory default connects internal terminators to internal

5 volts.

5.5 Serial-Port Pinout

The SCSI Switch contains two RS-232 serial ports, using DB9 female connectors;

these 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 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

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 52 53

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Black Box SC120A-R2 User Manual Page 27