RS232 Port Logger Software Our RS232 software allows to capture, log, analyze rs232 data from RS232 ports.
RS232 Port Monitor Software Our RS232 port monitor software allows to capture, analyze and debug rs232 data from RS232 ports. This software can work with ASCII, HEX or binary data

Serial (RS232) null modem cable (DB9-DB25). Pinout and signals for building a serial (RS232) nullmodem cable

Use this cable between two DTE devices (for instance two computers).

DB9 pin D-SUB female to PC1
 DB9 pin D-SUB female to PC1
DB25 pin D-SUB female to PC2
 DB25 pin D-SUB female to PC2

DB9 DB25
Receive Data
2
2
 Transmit Data
Transmit Data
3
3
 Receive Data
Data Terminal Ready
4
6+8
 Data Set Ready + Carrier Detect
System Ground
5
7
 System Ground
Data Set Ready + Carrier Detect
6+1
20
 Data Terminal Ready
Request to Send
7
5
 Clear to Send
Clear to Send
8
4
 Request to Send
Note: DSR & CD are jumpered to fool the programs to think that they are online.