Impulse 7204 - Manual (Page 15)

Technical Description
Sealevel Systems ULTRA 485+2.PCI Page 12
Connector Pin Assignments
RS-422/485
Signal Name Pin # Mode
GND Ground 5
TX + Transmit Data Positive 4 Output
TX- Transmit Data Negative 3 Output
RTS+ Request To Send Positive 6 Output
RTS- Request To Send Negative 7 Output
RX+ Receive Data Positive 1 Input
RX- Receive Data Negative 2 Input
CTS+ Clear To Send Positive 9 Input
CTS- Clear To Send Negative 8 Input
Technical Note : Please terminate any control signals that are not going to be used. The most
common way to do this is connect RTS+ to CTS+ and RTS- to CTS-. Terminating these pins, if
not used, will help insure you get the best performance from your adapter.