18
DHY-03 User Handbook
2
C
ONFIGUR
A
TION & C
ONTR
OLS
CONFIGURATION & CONTROLS
Momentary Latching Function -SW9 {OFF}
SW9 changes the function of the Remote Line Connect Switch between Momentary (OFF)
and Latching (ON).
Debug Function - SW10 {OFF}
SW10 is used to instigate the Debug Feature set by Parameter 6 in the Serial Port Interface.
Remotes
The remote port allows the user to control the line hold circuit from a mixing desk or other
remote device and also outputs opto-isolated outputs to indicate the line hold status and
the DTMF detect function. See chapter 4 for connection details.
RS232 Serial Port
The serial port allows the user to remote control the DHY-03 connection, including the
ability to dial out using Tone Dialling. This port is also used to adjust the operational
parameters and upload new firmware. Full details are given in chapter 3.
Figure 2-8 : DHY-03EC Diagram.
Jumper and Select Switcher Functions
J1
is used to switch an extra 10dB of audio input gain to allow for use of domestic level
mixing desks.
J2
selects incoming DC voltage to ±15V (1-2) or +5V (2-3).
J3
+
J4
set gains for signal to and from telephone line.
SW4
remote line hold output select.
SW5
Remote DTMF output select.
These switches define the operation of the remote outputs selecting between
Position 1: Output driven to +5V.
Position 2: Output driven to +15V (only if +15V supplied to board).
Position 3: Output pulled low.
1
2
3
Remote
LH
Select
Tx Gain
Jumper J3
Rx Gain
Jumpers
J4
On Board
Line Hold
SW4
SW5
On Board
Line Connect
LED
+10dB Gain for
Domestic Equpt
Jumper J1
Voltage In
Jumper J2
Remote
DTMF
Select
3
2
1
1
2
3