HP rp4440 HP DTC Cabling and Racking Guide - Page 60
RS-232 RJ45 Direct connection to HP printer with hardware handshake
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7 RS-232 connection RS-232 RJ45 Direct connection to HP printer with hardware handshake This cabling scheme is recommended for connecting to the following devices when a hardware handshake is necessary: HP Laserjet: HP Ruggedwriter: HP 2684A/P, 86A/D,HP33440A/F,47A/F,49A,59A, 41063A,C1200A,C1202A HP 2235 RJ 45 male connector to DTC RJ45 male connector 1 - RD INPUT 1 3 - TD OUTPUT 3 4 - CTS INPUT 4 5 - RTS OUTPUT 5 6 - SGND - 6 RJ45 extension cable RJ45 female connector 25-pin male connector to printer 1 2 - TD 3 3 - RD 4 20 - DTR 5 1 - PGND 6 7 - SGND RJ45 to DB25 4 - RTS adaptor OUTPUT INPUT OUTPUT OUTPUT Note HP Laser printers provide hardware flow control of host ports using DTR on pin 20. The HP DTC family provide hardware flow control of devices using RTS/CTS on pins 8 and 22. 54