HP LaserJet 4050 Printer series - Manual (Page 199)

EN
Specifications A-19
Hewlett-Packard offers the following serial cables and adapter for
use with the printer:
With the C2809A serial cable adapter installed on the printer, you
can connect a 25-pin cable connector to the printer. The adapter
pin connections are shown below.
25 to 9 Pin Adapter (C2809A)
Hardware Flow
Control (hardware
handshaking) By definition, hardware handshaking is performed when two programs
manipulate RS-232 control pins-DTR, DSR, RTS, and CTS to achieve
a hardware-based form of flow control. In DTR/DSR handshaking, the
sender asserts DTR (Data Terminal Ready) before sending the first
character in a stream of data and waits for DSR (Data Set Ready) to
be asserted in return. RTS/CTS handshaking is similar, but uses the
Request To Send and Clear To Send pins rather than Data Terminal
Ready. In either case, the sender delays transmitting data until the
receiver is ready.
HP Part Number Description
C2932A 9 to 9-pin M/F RS-232 Serial Cable, 3m
C2933A 9 to 25-pin M/F RS-232 Serial Cable, 3m
C2809A 9 to 25-pin M/F Serial Cable Adapter
Standard DB-25
(female adapter end) Printer DB-9
(male adapter end)
2- Transmit Data 2- Transmit Data
3- Receive Data 3- Receive Data
6- Data Set Ready 4- Data Set Ready
7- Signal Ground 5- Signal Ground
20- Data Terminal Ready 6- Data Terminal Ready
Serial Cable Specifications (Continued)
Specification Description