Keyspan 1.9 Serial Port Pin Outs, External Loopback Connector Information

Keyspan:High Speed USB Serial Adapter for Mac OS-v1.9 User Manual

7.1.d - Serial Port Pin Outs

The pin assignments for the Keyspan High Speed USB Serial Adapter's male DB9 port are illustrated below:

Keyspan High Speed USB Serial Adapter's

male DB9 port

Pin	Name	Signal Designation
1	DCD	Data Carrier Detect (Input)
2	RX	Received Data (Input)
3	TX	Transmitted Data (Output)
4	DTR	Data Terminal Ready (Output)
5	GND	Ground
6	DSR	Data Set Ready (Input)
7	RTS	Request To Send (Output)
8	CTS	Clear To Send (Input)
9	RI	Ring Indicator (Input)

In order to ensure compliance with emission specifications, cables should be shielded using braided shields and metal hoods with complete 100% contact between the shields and hoods.

External Loopback Connector Information

The Keyspan Serial Assistant allows you to perform two types of loopback tests - internal and external. The external test requires the use of a special loopback connector. This connector requires a "DB9 Female Loopback plug" with the following wiring:

Pin(s) Wired to Pin(s)

1 <-> 4,8

2 <->3

6 <-> 7,9

This User Manual applies to the Keyspan High Speed USB Serial Adapter Software for Mac OS.

(rev 02may12JA)

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