HP 4050 manual 25 to 9 Pin Adapter C2809A, Specifications A-19, Hardware Flow, Control hardware

Serial Cable Specifications (Continued)

Specification	Description
Hardware Flow	By definition, hardware handshaking is performed when two programs
Control (hardware	manipulate RS-232 control pins-DTR, DSR, RTS, and CTS to achieve
handshaking)	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.

Hewlett-Packard offers the following serial cables and adapter for use with the printer:

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

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)

Standard DB-25	Printer DB-9
(female adapter end)	(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

EN Specifications A-19