IBM 4840-544 Service Guide - Page 209
Parallel, connector
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August 3, 2006 Connector-pin assignments 15-pin serial connector: The 15-pin serial connector is a female connector. 8 1 15 9 Table 30. Assignments for 15-pin serial connector Pin Connector Pin 1 Carrier detect 8, 9 2 3 4 5 6 7, 10 Receive data 11 Transmit data 12 Data terminal ready 13 Ground 14 Ground 15 +5 V dc at 0.5 A maximum Parallel connector 13 1 25 14 Table 31. Assignment of parallel-connector pins Pin Signal I/O Pin 1 Strobe# I/O 14 2 Data bit 0 I/O 15 3 Data bit 1 I/O 16 4 Data bit 2 I/O 17 5 Data bit 3 I/O 18 6 Data bit 4 I/O 19 7 Data bit 5 I/O 20 8 Data bit 6 I/O 21 9 Data bit 7 I/O 22 10 Ack# I 23 11 Busy I 24 12 Pe I 25 13 Slct I Connector +12 V dc at 0.5 A maximum Distributed display present Data set ready Request to send Clear to send Ring indicate Signal I/O Auto Fd XT# O Error# I Init# O Slct In# O Ground Ground Ground Ground Ground Ground Ground Ground Appendix C. System specifications and planning information 183