Black Box LS4103A, User Manual, Page: 20 / 46

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CHAPTER 3: Installation
Table 3-1. DB9 pin signal descriptions.
Pin RS-232 RS-422/485 RS-485 Signal
(Full Duplex) 4-Wire 2-Wire Direction
(Full Duplex) (Half-Duplex)
1 DCD — — Out
2 RX RX- *Data B (-) In
3 TX TX- — Out
4 DTR — — In
5 GND GND GND —
6 DSR — — Out
7 RTS RX+ *Data A (+) In
8 CTS TX+ — Out
9 RI — — In
*Bidirectional RS-485 bus line.
3.6 Serial Connection
This server features rear-panel DIP switches that set the unit to the correct cable
configuration type to support connection with an RS-232/422/485 device.
The first time you use the server, set its serial port’s control function (see Table 3-2).
Table 3-2. Setting the DIP switch.
DIP-Switch 1 Position Function
On RS-232 console
Off Data communication