Sun Microsystems Interface Adapter manual Appendix B Null Modem Cable Requirements

FIGURE B-2illustrates a synchronous null modem cable that enables you to connect to to another system, Sun or nonSun, using the RS-449 interface. The Sun system supplies both the transmit and receive clocks for the other system. Note that this null modem cable is not symmetrical.

TxD (4,22)

RxD (6,24)

RTS (7,25)

CTS (9,27)

DSR (11,29)

SG (19)

DCD (13,31)

RxC (8,26)

DTR (12,30)

TxC (17,35)

Sun workstation

that supplies clocking

TxD (4,22)

RxD (6,24)

RTS (7,25)

CTS (9,27)

DSR (11,29)

SG (19)

DCD (13,31)

TxCI (5,23)

RxC (8,26)

DTR (12,30)

Sun System or other device

FIGURE B-2Null Modem Cable –Sun System Supplies Clocking for Both Sides

Appendix B Null Modem Cable Requirements 33