Telos NX12 User Manual download pdf (Page 33)

INSTALLATION | 23

PIN DESCRIPTION

5 Record Start 1

6 Ring Mute In 1

7 N/C

8 +5VDC (50mA max)

9 Record Stop 1

10 User Out (Dump) 2

11 Ringing Out 2

12 Priority Ringing Out 2

13 Ring Mute In 2

14 (reserved)

15 N/C

Note for the Curious

The DB- designation for D-Sub connectors is from Cinch Corp’s part numbering system. The

proper Cinch designation for a 15 pin D-Sub connector is a DA-15p (plug) or DA-15s (socket)

not DB-15! (Our thanks to Mike Schweizer, for contributing this tidbit.)

Input Characteristics

e NX12’s inputs are designed to be universal. ey accept either a voltage source up

♦

to 24VDC, or a closure to ground, which may be provided by switches, relays, or logic

outputs. In the latter case either ‘totem-pole’ or open-collector will work. e inputs are

active low.

A built in 1k Ohm pull up resistor is provided. ♦

Parallel logic input circuit:

+5V

Output Characteristics

Open collector to ground.

♦

ese will require a pull-up resistor to drive TTL-style logic inputs. Most equipment has ♦

the pull-up built into the input, but if there is no pull-up, you’ll have to add one, connect-

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Telos NX12 User Manual Page 33