23
APPENDIX A
Cable Pin Assignments & Signals
This appendix includes the following information:
■“Pin Assignments” on page 23
■“Interface Signals” on page 27

Pin Assignments

A shielded, hydra-style breakout cable providing four 37-pin, D-shell (DB-37) DTE
connectorsis available forthe SunHSI/U adapter. Since there are not enough wires to
create the signal ground (pin 19) connections, use the shield ground (pin 1) of the
DB-37 connector for this signal. The pin assignments for the cabling and connectors
are shown in TABLEA-1.
TABLEA-1 RS-449 Connector Pin Assignments
80-PinAmp.
PinNo.
RS-449
SignalName
RS-449DB-37
PinNo. Description
1 RxD1(A) 6 Port 1 Receive Data
2 RxD1(B) 24 Port 1 Receive Data
3 DTR1(A) 12 Port1 Data TerminalReady
4 DTR1(B) 30 Port1 Data Terminal Ready
5 TxD1(A) 4 Port 1 TransmitData
6 TxD1(B) 22 Port 1 TransmitData
7 RTS1(A) 7 Port 1 Request To Send
8 RTS1(B) 25 Port1 Request To Send
9 TxC1(A) 17 Port1 Transmit Clock