rs 422/485 - meaning of pinout abbreviations

[scalpas]

Hi

I need to work with RS422, using the NI USB-485 connector. I've found the pinout descriptions in this manual : http://www.ni.com/pdf/manuals/373170d.pdf

However, the pinouts are all abbreviations :

Pin	422/485
1	GND
2	CTS+ (HSI+)
3	RTS+ (HSO+)
4	RXD+
5	RXD-
6	CTS- (HSI-)
7	RTS- (HSO-)
8	TXD+
9	TXD-

GND is ground, but I don't know what the others are, and I found no definitions in the manual. Can anybody tell me what these all mean ?

[crossrulz]

The pins you will most likely need are the TX (transmit, data goes out) and RX (recieve, data comes in).  The rest of various handshaking and addressing lines (RS-485 has an addressing scheme).  All of the signals are differential, so there is the + and - for each signal.