DL107, DL207 and DL210 2.0 Digi-Loop™ DSP Induction Loop Amplifiers
11
The DL107/207 models provide a loop fault relay through a 3-position terminal block connection on the rear of the amplifier.
Pin 1 - NC (Normally Closed)
Pin 2 - Relay GND
Pin 3 - NO (Normally Open)
DL210 2.0 Loop Fault Relay connections
The DL210 models provide the relay as part of the “RS-232” DB-9 connector. The relay and RS-232 use separate pins and are completely isolated.
A597
232 RECEIVE DATA
232 REQUEST TO SEND (NOT USED)
TRANSMIT DATA
232 CLEAR TO SEND (NOT USED)
232 RING INDICATOR (NOT USED)
232 SIGNAL GROUND
CHASSIS GROUND (NOT USED)
1
2
4
3
5
6
7
8
9
LOOP FAULT NO
LOOP FAULT GND
LOOP FAULT NC
1
2
4
3
5
6
7
8
9
2
4
3
5
6
7
8
9
DB-9 CONNECTOR 1 (Male)
DB-9 CONNECTOR 2 (Male)
CABLE SHEILD
1
3rd-Party Control Cable
1
2
4
3
5
6
7
8
9
DB-9 CONNECTOR (Male)
CABLE SHEILD
Loop Fault Detection Wiring
LOOP FAULT NO
LOOP FAULT GND
LOOP FAULT NC
Trigger Input on 3rd Party Device
Trigger Input on 3rd Party Device
Trigger Input or Chassis GND
on 3rd Party Device
Loop Amplifier
DB-9 Jack
3rd-Party Control System
DB-9 Jack
Loop Amplifier
DB-9 Jack
RS-232:
Pin 2 - Receive
Pin 3 - Transmit
Pin 5 - Signal GND
Loop Fault:
Pin 1 - Loop Fault NO
Pin 4 - Ground
Pin 6 - Loop Fault NC
Loop Wire Selection
To select the proper wire for the loop(s), refer to the following chart. Wire resistance of each loop needs to be 0.5 - 3.0 Ω as required by the
amplifier.
Wire type
AWG / (CSA)
DC
Ω
per
1000 ft
(305 m)
Max length
Approx ft (m)
Min length
Approx ft (m)
Single
conductor
18 (0.82 mm
2
)
6.4
234 (71 m)
78 (24 m)
16 (1.3 mm
2
)
4.2
360 (110 m)
120 (37 m)
14 (1.9 mm
2
)
2.4
630 (192 m)
210 (64 m)
12 (3.3 mm
2
)
1.5
1000 (305 m)
333 (101 m)
10 (5.3 mm
2
)
1.0
1500 (457 m)
500 (152 m)
Flat 3/4”
copper
~14 (1.9 mm
2
)
2.4
630 (192 m)
210 (64 m)
Powering Up
Connect the inputs and outputs as desired (referring to the last section). Make sure the loop wire resistance measures 0.5Ω - 3Ω. Connect the IEC
power cable supplied, and power up the amplifier using the switch on the back panel.
