Telos NX12 user manual Input Characteristics, Output Characteristics

Installation  23

PIN DESCRIPTION

5Record Start 1

6Ring Mute In 1

7N/C

8+5VDC (50mA max)

9Record Stop 1

10User Out (Dump) 2

11Ringing Out 2

12Priority Ringing Out 2

13Ring Mute In 2

14(reserved)

15N/C

81

p a r a l l e l C o n T r o l

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

♦♦ The NX12’s inputs are designed to be universal. They 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. The inputs are active low.

♦♦ A built in 1k Ohm pull up resistor is provided. Parallel logic input circuit:

+5V

3 0 v m a x

Output Characteristics

♦♦ Open collector to ground.

♦♦ These 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-