User's Manual

Jotron AS| TR7750C: Operators Manual  Operating Instructions
Page 5-11
P/N: 84748 (G)
Menu path:
TX config ►
Parameter
Range
Default
Details
Keying
Loop key bias
Ground, +12V,
Floating
Floating
Connects the centre pin of the line input
transformer to:
 Floating: The centre pin is not
connected. If loop keying is used,
an external voltage must be
applied to pin 3 (REM connector)
in order to key the transmitter
 Ground: The centre pin is
grounded. If loop keying is used,
an external voltage must be
applied to pin 3 (REM connector)
in order to key the transmitter.
 +12V: A 12V DC is supplied on pin
3(REM connector). The transmitter
can be keyed with a relay (or
equivalent) that create a DC path
on the line input pin, pin 3 and 6
(REM connector).
Calibrate
Ref oscillator
-127 – +128
0
This setting is used to fine adjust (calibrate)
the reference oscillator of the transmitter.
The full range is approximately 10 ppm. This
setting should be used with care, and only
when a calibrated frequency measuring
instrument is connected to the transmitter.
Table 5.5-2, TX config group, transmitter
5.5.3 Interface config group
Menu path:
Interface
config ►
Parameter
Range
Default
Details
Access control
SysOp,
Technician,
Operator,
Restricted
SysOp
Set the user access level for local control.
This setting limits the availability of some
menus, depending on the access level. In
order to set the access level from the user
interface, a special hardware key must be
inserted into the microphone/headset
connector. Details of the key is available in
chapter Error! Reference source not
ound.
Set language
Depending on
model
English
Set the language to use on the user
interface. Availability of different languages
depends on specifications when ordering
the transmitter.
Alarm config
Alarm pin pull-up
Disabled |
Enabled
Enabled
The ALARM_OUT_P and ALARM_OUT_N
output pins on AUX1 is used to signal that
the radio has an alarm. This parameter
applies a pull-up voltage to ALARM_OUT_P
when there are no alarms present. When an
alarm is detected the relay contact close.
Alarm config
Select polarity
High to select|
Low to select
Low to
select
The SELECT_IN_P and SELECT_IN_N
input pins on AUX1 can be used to select /
deselect (Standby) the radio with an
external signal (e.g. alarm from a main
radio). This setting determines if the radio
should be operational on a low select input
signal or a high select input signal.
RS485
Bitrate
1200 – 115200
1200
Set the bit rate to use on the RS485 port