User Manual

Canoga Perkins

Table 4-B.

RS-449 Pinouts

* The extra clock is an enhancement added to -422 interfaces. Any -422

interface card outfitted with this capability can be identified via the lack

of the W16 / W15 BAL_CTRL jumper. The W16 / W15 jumper was

never described in the manual, so do not try to find a reference to it in the

manual.

Pin RS-449 Direction

Number PIN Name

A/B (abbrev) (full name)

1 SHLD shield -

4/22 SD send data to modem

5/23 ST send timing from modem

6/24 RD receive data from modem

7/25 RS request to send to modem

8/26 RT receive timing from modem

9/27 CS clear to send from modem

10 LL local loopback to modem

11/29 DM data mode from modem

12/30 TR terminal ready to modem

13/31 RR receiver ready from modem

14 RL remote loopback to modem

15 IC incoming call from modem

17/35 TT terminal timing to modem

18 TM test mode from modem

19 SG signal ground -

20 RC receive common - (tied to SG)

33 SQ signal quality from modem

34 NS new signal to modem

37 SC send common to modem

2/36* N/A extra clock for to modem

receive data