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pinout (распиновка)

EIA-449 (RS-449) Secondary connector

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

9 pin D-SUB MALE connector  at the computer
Pin Name RS232 V.24 Dir Description
1   n/a 101 --- Shield
2 SSR SRR 122 <-- Secondary Receiver Ready
3 SSD SSD 118 --> Secondary Send Data
4 SRD SRD 119 <-- Secondary Receive Data
5 SG SG 102 --- Signal Ground
6 RC RC 102b --- Receive Common
7 SRS SRS 120 --> Secondary Request To Send
8 SCS SCS 121 <-- Secondary Clear To Send
9 SC SC 102a --- Send Common

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.

Источник: RS449 Page at Connectivity Knowledge Platform (Made IT)