Sun-microsystems Interface Adapter User Manual download pdf (Page 53)

Appendix B Null Modem Cable Requirements 33

FIGURE B-2 illustrates 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.

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

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

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

that supplies clocking

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