Perle Systems Adaptors Definitions of Signals and Direction

UltraPort Serial Adaptors User Guide
Definitions of Signals and Direction Page 103
Chapter 3 Cabling information
Definitions of Signals and Direction
EIA-232 EIA-422 EIA-485 Direction Description
RI In Ring Indicator
DCD In Data Carrier Detect
RTS Out Request To Send
RTS+ Out Request to Send
RTS- Out Request to Send
DSR In Data Set Ready
TXD Out Transmit Data
TXD+ Out Transmit Data
TXD- Out Transmit Data
TXD-/RXD- In/Out Transmit/Receive Data
TXD+/RXD+ In/Out Transmit/Receive Data
RXD In Receive Data
RXD+ RXD+ In Receive Data
RXD- RXD- In Receive Data
S-GND S-GND S-GND Signal Ground
CTS In Clear to Send
CTS+ In Clear to Send
CTS- In Clear to Send
DTR Out Data Terminal Ready
C-GND C-GND C-GND Chassis Ground
Note
Only the UltraPort SI series of cards supports EIA-422 and EIA-485
interface modes.