CTI Products NCB/AY with Serial Interface - Manual (Page 45)

CTI Products, Inc. NCB-AY User Guide
Appendix C. Connector Details 39
The following table shows the wiring list for back-to-back connections of two NCB-AY modules.
NCB 1 Signal Name NCB 1 Pin NCB 2 Pin NCB 2 Signal Name
TXD 3 2 RXD
RXD 2 3 TXD
DTR 4 6 DSR
DSR 6 4 DTR
CTS 8 7 RTS
RTS 7 8 CTS
ground 5 5 ground