Parallel logic input circuit, Output characteristics open collector to ground – Telos NX12 User Manual
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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
p
a
r
a
l
l
e
l
C
o
n
T
r
o
l
1
8
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:
3 0 v m a x
+5V
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-