WCS-232_v6.0_User Manual_Eng_DM v1.0.1

WCS-232 v6.0 User Manual
66
D.1.2. Pin Assignment
Data transmission devices based on serial communication are divided into DTE(Data Terminal Equipment) devices
and DCE(Data Communication Equipment) devices. Generally, terminal devices such as PCs are DTE, whereas data
relay devices such as modems are DCE.
For products comply with the RS-232 standard,
1) If you want to use a DTE device in conjunction with a DCE device, you should either connect the two devices
directly or use a straight cable. This means that the control signal lines including the TX and RX signal lines should
be directly connected.
2) On the other hand, if you are connecting two same types, DTE and DTE, or DCE and DCE devices, use a cross
cable(also called a Null Modem cable). This cable allows the control lines including the TX and RX signal lines to be
crossed between the two devices.
WCS-232 is a DCE device that is designed to be mounted directly to a PC. Therefore, when connecting to a DTE
device, it should be mounted directly to the serial port of the DTE device or connected suing a straight cable. When
connecting to a DCE device such as a modem or equipment which is commonly used connected to a PC, cross cable
should be used.
If you are connecting to a product that does not comply with the RS-232 standard, please refer to Appendix A
Connection to connect with WCS-232.