Null-Modem Cable - Black Box 12-Port 1000BASE-TX L2 Managed PoE Switch User Manual

1.3 Null-Modem Cable

Use the included DB9 cable to connect a terminal or terminal emulator to the managed switch's RS-232 port to
access the command-line interface. Table 1-1 shows the pin assignments for the DB9 cable.
Table 1-2 shows the pin out for the null-modem cable.
Signal
CD
DSR
DTR
RXD
TXD
GND
RTS
CTS
Not used
Table 1-1. Command-line interface DB9 connector pin out.
Function
Carrier (CD)
Receive Data (RXD)
Transmit Data (TXD)
Data Terminal Ready (DTR)
Signal Ground (GND)
Data Set Ready (DSR)
Request To Send (RTS)
Clear To Send (CTS)
Table 1-2. Null-modem cable pin out.
Pin
1
6
4
2
3
5
7
8
9
CHAPTER 1: Specifications
Pin
1
2
3
4
5
6
7
8
Pin Signal
4 DTR
1
CD
6
DSR
3 TXD
2 RXD
5 GND
8 CTS
7 RTS
9 Not used
9