Connector - EIA-449 (RS-449) Secondary

Common names: EIA-449, RS-449, ISO 4902
Secondary (auxilary) channel

(at the Computer)

Pin	Name	Direction	Description
1		---	Shield (n/a) (V.24 101)
2	SSR	Input	Secondary Receiver Ready (SRR) (V.24 122)
3	SSD	Output	Secondary Send Data (SSD) (V.24 118)
4	SRD	Input	Secondary Receive Data (SRD) (V.24 119)
5	SG	---	Signal Ground (SG) (V.24 102)
6	RC	---	Receive Common (RC) (V.24 102b)
7	SRS	Output	Secondary Request To Send (SRS) (V.24 120)
8	SCS	Input	Secondary Clear To Send (SCS) (V.24 121)
9	SC	---	Send Common (SC) (V.24 102a)

Note: Direction is DTE (Computer) relative DCE (Modem).
Note: RS232 column is RS232 circuit name.
Note: V.24 column is ITU-TSS V.24 circuit name.

Source: HW-Book 2001-06-08
Last modified: 2007-06-27 14:22:58.0
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