HP rp7405 HP DTC Cabling and Racking Guide - Page 63
RS-232 Modem connection to HP Vectra PC 9-pin connector
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7 RS-232 connection RS-232 Modem connection to HP Vectra PC (9-pin connector) This cabling scheme is recommended for connecting the following: HP Vectra with 9-pin connector: HP Vectra interfaces: Existing HP cable: 386/XX, 486/XX 24540B port A, 24541B port B HP 24542M 25-pin male connector to DTC 1 - PGND 2 - RD 3 - TD 4 - DCD 5 - GPO 6 - DTR 7 - SGND 8 - RTS 20 - DSR 22 - CTS INPUT OUTPUT INPUT OUTPUT OUTPUT OUTPUT INPUT INPUT 9-pin female connector to HP Vectra 3 - TD 2 - RD 7 - RTS 8 - CTS 6 - DSR 5 - SGND 1 - DCD 4 - DTR 9 - RI OUTPUT INPUT OUTPUT INPUT INPUT INPUT OUTPUT INPUT Note To be used with US modem behavior only. The HP24542M cable connects pin 9 of the HP Vectra to pin 22 of the DDP. This is not recommended when making your own cables. 57