Connect Tech Blue Heat/PCI PCI Serial Communications - Manual (Page 29)

Blue Heat/PCI User’s Manual, Connect Tech Inc.
29 Revision 0.11
Figure 9: Blue Heat/PCI, RS-422/485, 20mA CL and Universal Blue Heat/PCI RS-422/485 I/O Box
External I/O Box
(p/n: IOB08DB9 or
IOB08DB9V1)
Male DB-9 connectors
Mounting bracket
DB-78 connector
Table 9: DB-9 pinouts for Blue Heat/PCI RS-232, RS-422/485, 20mA CL and Universal Blue Heat/PCI
RS-422/485 I/O Box
Pin
No. RS-232
Signal
Direction RS-422/485
Signal
Direction
20mA
Direction
1 DCD input RxD B(+) input RxD(-) input
2 RxD input TxD B(+) output TxD(+) output
3 TxD output TxD A(-) output TxD Source output
4 DTR output RxD A(-) input TxD Return output
5 SG signal gnd. SR signal ref. SG sig. gnd.
6 DSR input CTS A(-) input RxD Return input
7 RTS output RTS A(-) output TxD(-) output
8 CTS Input RTS B(+) output RxD(+) input
9 RI Input CTS B(+) input RxD Source input
Male DB-9 Connector
1 5
6 9