VXL Instruments Ltd. Itona TC4XYY Hardware User’s Guide
Cables 10/100 LAN Cable
Cross Connection - (Without Hub)
TXD+ 1 3 RXD+
TXD- 2
2 TXD-
RXD+ 3 1 TXD+
RXD- 6
6 RXD-
RJ45
Pin RJ45
Pin
Straight Connection - (With Hub)
TXD+ 1 1 TXD+
TXD- 2
6 RXD-
RXD+ 3 3 RXD+
RXD- 6
2 TXD-
RJ45
Pin RJ45
Pin
COM Port (Serial Port) Cables
Serial devices like modems and printers use 25 pin D-type connectors for RS232 connections. In order
to connect an RS232 device with a 25-pin connector, 9-pin connector signals must be converted to 25-
pin connector signals as shown in the following diagram.
9-pin to 25-pin Cross Connection
9 Pin
Connector 25 Pin
Connector
3RXD
2TXD
5CTS
4RTS
6DSR
7SGND
8DCD
20 DTR
TXD 3
RXD 2
RTS 7
CTS 8
DSR 6
SGND 5
DCD 1
DTR 4
(Thin Client)
Connectors and Cables 16