Kingfisher Plus+ Hardware Manual
Line/Radio Option Board Specifications
Baud rate
1200 Baud
Modulation
FSK, CCITT V.23
Carrier detect input
Optical isolation
Active low or high
Min. input 2 mA (70 V
DC
maximum)
RTS/PTT output
Optical isolation
Open collector output
Active low
30 V
DC
maximum / 20 mA maximum
Microwave networks typically use a negative supply rail for the
carrier detect circuit. The more positive rail should be connected
to pin #6 (RTS/PTT) and the difference between the rails must
not exceed 30 V
DC
.
Output impedance
30 kΩ
Input impedance
30 kΩ
Line termination
600 Ω
Line configuration
2 or 4 wire
The port is not full duplex and cannot use the full duplex
functionality of a 4-wire configuration.
4-wire configurations eliminate the ability to communicate peer
to peer but allow an increased number of drops on one link.
Line drive in multi-drop
configuration
10 drops for 2 wire
20 drops for 4 wire
Transmit output level
-6 dBm (LINE-2)
-6 to -21 dBm software configurable (LINE-L)
Receive level
-43 dBm to -9 dBm
Internal Power
Consumption
20 mA from +5 V
DC
Bus on backplane
Transmission Distance
Allowing 3dB for background noise and a 10dB fade margin, up
to 24dB of cable loss can be tolerated. Therefore, transmission
distance = 24 / cable loss per Km (dB). Note: if there are more
than 2 RTUs (or other devices) on the line, reduce the allowable
cable loss (24) by 1dB per additional RTU or device.
Isolation
Maximum working voltage in respect to system earth/ground
must not exceed TNV-2 limits (80 V)
Transient voltage: 3.88 kV
Operating Temperature
-20 to +70 °C
Storage Temperature
-40 to +85 °C
Operating Humidity
5 to 95 % RH (non-condensing)
Hardware Manual Version 7.16
http://www.servelec-semaphore.com/
Page 111
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