20
MDS P-60/P-60 HL Reference Manual
MDS 05-2818A01, Rev. C
Invisible place holder
Figure 9. Analog Interface/Utility Board, P/N 03-2110A01
Keyline Options
Several methods may be used to key the transceiver, depending on the facilities
available at the installation site and the design of the customer-supplied data
equipment. (See
Figure 10 on Page 22
.) This section discusses three common
keying methods. Contact the factory if further assistance is required.
Positive or Negative Keying
One keyline option is to use a keyed 12 to 25 volt source or a fixed voltage
source and a series relay. The relay contacts can be included in either the pos-
itive or negative supply lead. (See
Figure 10 on Page 22
, examples 1 and 2.)
The use of an opto-isolator allows both keying supply leads to “float” above or
below ground, and tolerates line to ground transients up to 2500 volts. TB1 Pin
7 must be positive with respect to TB1 Pin 8. For keying supply voltages higher
than 25 volts, add a resistor in series with the connection to TB1 Pin 7 or TB1
Pin 8 to limit the keying current to 10 to 20 mA.
9
AC Alarm
Normally 11 Vdc; drops to zero volts if an AC failure occurs.
10
Received Signal Strength
Indication (RSSI)
Approximately 0 to 5 Vdc through a 10K resistor.
8 & 11
Keyline connection when an
internal current source is used.
(Requires a jumper between Pins
7 and 12.)
This method uses the on-board 12 volt DC supply. For more
information, see “Keyline Options” discussion below.
12
+13 Vdc
Accessory power (1 Amp maximum). Jumpered to Pin 7 for
keying with an internal current source. See description for
Pins 8 & 11 above.
Table 3. Pin Connections (Analog Interface/Utility Board) (Continued)
TB1
Pins
Connection
Remarks
LINE 2/DC +
NEUTRAL
LINE 1/DC
+13V ACCY
GND
RSSI
AC ALARM
KEYLINE LO
KEYLINE HI
GND
RX AUDIO
RX AUDIO
GND
TX AUDIO
TX AUDIO
2
3
1
00-00000-00
POWER
CONNECTIONS
(TB2)
INTERFACE
CONNECTIONS
(TB1)
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
J5
J4
J7
F5
F4
F3
J3
J2
J6
J1
F1
F2
T2
T1
TB1
TB2
MOV1
MOV2
26
25
2
1
25
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