Black Box IC187C - Manual (Page 27)

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2-PORT RS-232/422/485 PCI HOST ADAPTER
Appendix B: Connector Pinouts
B.1 RS-232
Table B-1. Pinout of Connector Set to RS-232
Abbreviation Name Pin # Mode
TD Transmit Data 3 Output
RTS Request To Send 7 Output
DTR Data Term Ready 4 Output
GND Ground 5
RD Receive Data 2 Input
DCD Data Carrier Detect 1 Input
DSR Data Set Ready 6 Input
CTS Clear To Send 8 Input
RI Ring Indicator 9 Input
NOTE
These pin assignments meet the EIA/TIA/ANSI-574 standard for RS-232
DTE pinning on DB9 connectors.