Curtiss-Wright SSR/CHS/001 User manual

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24 Nov. 2020 | DST/AE/022 SSR/CHS/001/D
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SSR/CHS/001
Ethernet multi-role recorder (CompactFlash®, voice connector) - 4
user-slots
Key Features
•Rugged CompactFlash-based 100BaseTX
Ethernet recorder
•Built in GPS, digital IRIG-B, PTPv1 and PTPv2
synchronization including Grandmaster
•Battery-backed up time
•Operating range of -40 to 85
o
C
•Up to 40 Mbps logging speed
•Fat 32 file system
•Four user slots for plug-in modules
Applications
•Data logging and/or muxing
Overview
SSR-500s are compact, lightweight, rugged recorders with integrated
data acquisition. The SSR/CHS/001 is an SSR-500 chassis for which a
range of plug-in modules is available, providing interfaces such as A/D
conversion, avionic bus monitoring, and video compression. Built-in
inputs include audio and IRIG-B/GPS. A rear panel Ethernet port is
provided for setup and real-time monitoring. Control is via a START/STOP
switch and an EVENT button, via external start/stop and event inputs
through the I/O connector, or SNMP commands through the Ethernet link.
Data is stored on a removable CompactFlash memory card, currently with
capacities of up to 128 GB industrial grade. A PC identifies such
removable storage as a FAT32 drive so files are instantly accessible with
no need for additional conversion software. Files are in the popular PCAP
format and are readable by the GS Works 9 display and analysis package,
as well as other third party software products.
The front panel is designed to be user-friendly with a clean and simple
layout. The setup software, DAS Studio 3, is streamlined for fast
configuration, with minimal time required before the system is ready to
record.
Figure 1: Block diagram for the SSR/CHS/001

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All trademarks are the property of their respective owners.
SSR/CHS/001
Specifications
All values provided in the following specification tables are valid within the operating temperature range specified under
“Environmental ratings” in the “General specifications” table.
TABLE 1 General specifications
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
User slots – – 4 –
Dimensions Design metric is millimeters.
height – 85 – mm
height – 3.34 – in.
length – 163 – mm Measurement of main body, not including the front panel
switch and back panel connectors.
length – 6.41 – in.
width – 127 – mm Measurement of main body, not including flanges.
width – 4.9 – in.
Unit power supply
28V – 300 – mA
total power – 8.4 – W See “Understanding power consumption in the
SSR/CHS/001” on page 18.
Mass Design metric is kilograms.
fully populated
(without CompactFlash card)
– 1.91 – kg Typical module weight of 75g.
fully populated
(without CompactFlash card)
–4.2– lb
fully populated
(with CompactFlash card)
–1.94– kg
fully populated
(with CompactFlash card)
–4.27– lb
Environmental ratings See Environmental Qualification Handbook for Network Switch and Recorder
Products.
operating temperature -40 – 85 °C Chassis base/side plate temperature.
storage temperature -40 – 85 °C
LCD operating range -30 – 70 °C For more information, see “Front panel display” on page 18.
Logging speed – – 40 Mbps Subject to CF card and frame length (see the CompactFlash
cards data sheet).
Mounting screws – 6 – – Quarter-turn Dzus panel-mount screws.
Finish Electroless nickel-plated.
base, side and end plates – – – – Painted black GRIGIO SCURO OPACO C604.
TABLE 2 Active antenna inputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs – – 1 –
Bias voltage 5.15 – 5.35 V
Bias current – – 50 mA
Signal strength -138 – – dBm
Antenna gain 10 26 50 dB

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SSR/CHS/001
Figure 2: SSR/CHS/001 mechanical drawing (mounting brackets must be ordered separately)
85,00 127,00
143,00
29,70
50,80
50,80
31,70
153,00
163,00
4,00
9,50
9,50
14,00
28,50
28,50
14,00
127,00
146,00
159,00
85,00
9-way connector
10-way micro-miniature connector
19-way micro-miniature connector
6-way bayonnet power connector
GPS Antenna Connector
GroundMountingBolt
Drill&Taptosuit10-24UNC.
Torque(Max):.5Nm(Lbfin)
LED (2 OFF)
Mounting Bracket
(6 OFF)
1/4 Turn Dzus Fastener
(6 OFF)
Nylon Battery Mount

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SSR/CHS/001
TABLE 3 Electrical specifications
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Input range 18 28 40 V 2A max. therefore 36W at 18V supply.
Reverse polarity protection -40 – – V
Current available
+5V 0 – 2,400 mA
±7V 0 – 2,000 mA Combined load on both supplies must not exceed 15W.
±12 0 – 1,250 mA Combined load on both supplies must not exceed 15W.
Short circuit duration
+5V ∞ – – s Indefinite to GND.
±7V ∞ – – s
±12 ∞ – – s
Glitch immunity – 20 – ms Typical glitch immunity at 28V.
Efficiency – 75 – % At full load.
Physical
connector – – – – Bayonet connector.
placement – – – – Not removable.
TABLE 4 Onboard GPS receiver
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs – – 1 –
Time accuracy – – 1 μs
Position accuracy
2D fix 2.5 – 22 m Circular Error Probable.
3D fix 2.5 – 22 m Spherical Error Probable.
3D fix 2 – – m With Satellite-Based Augmentation Systems.
Satellite acquisition time
reacquisition 3.5 5 – s
warm power-up – 40 – s
cold power-up – 60 – s Test carried out with a minimum of four satellites in use.
GPS update rate – 1 – Hz
Navigation datum – – – – World Geodetic System-84 (WGS-84).
Restrictions Coordinating Committee for Multilateral Export Controls
(COCOM) restrictions apply.
velocity – – 1,854 kph
velocity – – 1,000 knots
altitude – – 18,000 m
altitude – – 60,000 ft

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SSR/CHS/001
TABLE 5 PTP Synchronization specification
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Time accuracy Measured over the full temperature range with temperature
changing at up to 1°C per minute.
mean error – 10 40 ns Mean of PPS errors calculated over ±60 seconds from any
reading.
instantaneous error – 20 250 ns After synchronization is achieved, with no loss of connection
to Grandmaster.
Time to synchronize Measured from a power-up of the test chassis, using a
Meinberg M600 IEEE 1588 Grandmaster, supplying PTPv1
messages to the SSR/CHS/001 via OnTime T208 switch,
configured in IEEE 1588 transparent mode.
1 μs – 50 – s
250 ns – 75 – s
TABLE 6 PTP grandmaster
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Grandmaster accuracy
digital IRIG -2 – 2 μs
GPS -2 – 2 μs Error relative to precise reference clock, GPS signal from
antenna which has a clear view of the sky.
PTP address
IP address – 224.0.0.
129,
224.0.0.
107
– – PTP, UDP port numbers are 319 and 320. PTPv2 in P2P
mode uses additional IP address (224.0.0.107) for delay
measurement.
PTP sync interval
1588v1 – 2 – s Sync interval when operating as a PTPv1 Grandmaster, or
when connected to an external PTPv1 Grandmaster.
1588v2 – 1 – s Sync interval when operating as a PTPv2 Grandmaster, or
when connected to an external PTPv2 Grandmaster.
TABLE 7 Differential ended audio inputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs – – 2 –
Sampling rate
VOICE[1:0] – 64 – ksps

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Input voltage
operating range (Gp = 1) -30 – 8 dB Primary gain = 1; 0 dB = 489 mV.
overvoltage protection -40 – 40 V Voltages outside of this range can damage input.
Analog filter
BandPass 3 – 3,400 Hz
Input resistance
between inputs – 135 – kΩ Module powered off.
between inputs – 1 – MΩ Module powered on.
each input to GND – 27 – kΩ Module powered off.
each input to GND – 300 – kΩ Module powered on.
TABLE 8 Ethernet interface
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs/outputs – – 1 – IEEE 802.3 compatible; 100BaseTX only.
Physical
connector – – – – Micro-miniature, circular connector.
placement – – – – Not removable.
TABLE 9 RS-485 inputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs – – 1 –
Signalling rate
DIGITAL_TIME_IN – – 100 bps Operating as IRIG-B input, the following time codes are
supported: IRIG-B 000, 001, 002, 003.
Input voltage
operating range 0 – 5.25 V
logic 0 0 – 0.7 V
logic 1 2 – 5.25 V
overvoltage protection -0.3 – 6 V Voltage in excess of these values can damage input.
Signalling currents
logic 0 – -0.2 -0.5 mA
logic 1 – 2 5 mA
Input resistance
each input to GND – 27 – MΩ Module powered on.
each input to GND – 53 – kΩ Module powered off.
Time error
offset – – 2.5 μs Over full operating temperature range. When configured as
primary (TTL_IRIG) input range.
TABLE 7 Differential ended audio inputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS

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TABLE 10 Battery-backed real-time clock
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Drift Determined by the temperature compensated crystal
oscillator (TCXO) in controller.
on – – 3 ppm
off – – 100 ppm
Battery duration – – 4 years Expiry date is labeled on battery mount.
TABLE 11 RS-422 inputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs – – 2 –
Signaling rate
START_STOP+ – – 0.5 Hz When START_STOP is logic 1, packets are recorded; when
logic 0, no packets are recorded.
START_STOP- – – 0.5 Hz
EVENT+ – – 0.5 Hz Event is triggered when signal changes from logic 1 to logic 0
or from logic 0 to logic 1.
EVENT- – – 0.5 Hz
Input voltage
operating range -7 – 12 V Do not exceed operating range.
logic 0 – – -0.2 V VIN+ - VIN-.
logic 1 0.2 – – V VIN+ - VIN-.
overvoltage protection -27 – 27 V Voltages outside of this range can damage input.
ESD protection -15 – 15 kV Human Body Model.
Input resistance
between inputs – 120 – Ω Module powered on.
between inputs – 120 – Ω Module powered off.
each input to GND – 300 – kΩ Module powered on.
each input to GND – 80 – kΩ Module powered off.
TABLE 12 RS-422 outputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Outputs – – 1 –
Signaling rate
PPS+ – – 1 Hz
PPS- – – 1 Hz Pulse per second output.

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SSR/CHS/001
Output voltage
operating voltage -7 – 12 V Absolute voltage of the operating signal must stay within this
range.
logic 0 – – -2 V V0+ - V0- ; RLOAD = 100Ω.
logic 1 2 – – V V0+ - V0- ; RLOAD = 100Ω.
short circuit current – – 250 mA
short circuit duration ∞ – – s Only one output may be shorted at a time.
ESD protection -15 – 15 kV Human Body Model.
Output resistance – 1.5 – kΩ
TABLE 13 BTTL outputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Outputs – – 1 –
Signaling rate
REC_STATUS – – 1 Hz Recorder status; high indicates an error condition. Mirrors
the Error LED.
Output voltage
logic 0 – – 0.44 V Sinking 24 mA.
logic 1 3.76 – – V Sourcing 24 mA.
short circuit current – – 50 mA
short circuit duration ∞ – – s To GND.
Output resistance – 121 – Ω
TABLE 14 Brightness control inputs
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS
Inputs – – 1 –
Input voltage
BRIGHT/DIM± -10 0 10 V DC level controls the brightness of the front panel. Range of
0 to 100% brightness is controlled by an SNMP command.
Isolation voltage – – 1,000 V
Input resistance
LAMP(0) to LAMP(1) 2.3 2.8 3.3 kΩ
TABLE 12 RS-422 outputs (continued)
PARAMETER MIN. TYP. MAX. UNITS CONDITION/DETAILS

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SSR/CHS/001
Setting up the SSR/CHS/001
All module setup can be defined in XML using XidML® schemas (see http://www.xidml.org).
Instrument settings
SETUP DATA CHOICE DEFAULT NOTES
Manufacturer - - -
Name ACRA CONTROL ACRA CONTROL Name of manufacturer.
PartReference SSR/CHS/001/D SSR/CHS/001/D The instrument part reference.
SerialNumber AAA1234 AAA1234 Unique name for each module.
Settings - - -
Is Leap Year False
True False Specifies if the current year is a leap year.
IP Address 0.0.0.0 to 255.255.255.255 192.168.28.1
Specifies the IP Address of the instrument. This set-
ting cannot be changed directly on the instrument,
but its value is needed so that the instrument can be
programmed.
IENA Only System True
False False
This setting is used to generate consistent packet
timestamps. Set to True when the system uses IENA
timestamps only.
Primary Input
IRIGB
GPS
PTP
IRIGB Selects which time source PTP, GPS or IRIG-B has
priority.
Allow Secondary Input True
False True
If Primary Input is GPS/IRIG-B then allow IRIG-
B/GPS to act as secondary time source, when pri-
mary is unavailable.
Settings
PTP --
Settings relating to PTP synchronization and time
conversions.
PTP Protocol PTPv2 Delay Req
PTPv1 PTPv2 Delay Req
Determines supported IEEE 1588 protocol (PTP)
where PTPv1 corresponds to IEEE 1588-2004 and
PTPv2 corresponds to IEEE Std 1588-2008.
PTP Grandmaster True
False False Determines whether the module acts as a PTP
Grandmaster.
PTP Leap Seconds 0 to 256 37 Current leap second count. Offset between PTP time
and UTC time.
Synchronisation Level 500 to 10000 500
The unit considers itself in sync if the last calculated
offset from its time master is less than this. Units are
nanoseconds.
Settings
PTPv1 ---
PTPv1 Subdomain
_DFLT
_ALT1
_ALT2
_ALT3
_DFLT Name of the PTPv1 subdomain to use.
PTPv1 Sync Interval 1
22Interval, in seconds, between sync messages, if the
module is operating as a PTPv1 Grandmaster.
PTPv1 Preferred Grandmaster True
False True Indicates whether the SSR/CHS/001 is a preferred
PTP Grandmaster.
Settings
PTPv2 ---
PTPv2 Subdomain 0 to 255 0 The PTPv2 subdomain to use.

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SSR/CHS/001
PTPv2 Announce Interval
1
2
4
8
16
2Interval, in seconds, between announce messages, if
the module is operating as a PTPv2 Grandmaster
PTPv2 Sync Interval
0.5
1.0
2.0
1.0 Interval, in seconds, between sync messages, if the
module is operating as a PTPv2 Grandmaster.
PTPv2 Priority 0 to 255 128
Set the relative priority of the master, 0: highest prior-
ity, 255: lowest priority, used by the best master
clock algorithm for PTPv2, IEEE Std 1588-2008,
#9.3.4.
Settings
IRIG-B-In - - Settings on the IRIG-B input
Current Year 2010 to 2100 2019 Indicates the current year.
Settings
Recorder - - Settings used by PCAP recorders
Wrap Around True
False False
In normal mode, recording stops when the disk is full.
If Wrap Around is enabled, the oldest file is deleted
and recording continues.
Recorder Control Method
Local
Network
External
Local
Selects whether the recorder is controlled from its
Local front panel, via SNMP over the Network, or by
External I/O lines.
Memory Utilization Threshold 0 to 10000000 12800
Sets the number of megabytes of remaining disc
space, at which the recorder display will start blink-
ing to indicate that memory is low. A value of 0 dis-
ables the warning.
Record from Ethernet True
False True Enables/disables the Ethernet-in recording without
affecting recording from the internal chassis
Store Ethernet Frame CRC True
False False
Determines whether the Ethernet packet frame check
CRC is included in the PCAP file as if it were data
bytes in the packet.
Settings
Brightness - - Control of the brightness of the display on the unit.
SETUP DATA CHOICE DEFAULT NOTES

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SSR/CHS/001
Bright Mode
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
10 Voltage level on the input which corresponds to
100% brightness of the LCD.
Dim Mode
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-10 Voltage level on the input which corresponds to 0%
brightness of the LCD.
Settings
Event Settings --
Defines event packets or periodic status event pack-
ets.
Event Destination IP Address 0.0.0.0 to 255.255.255.255 127.0.0.1 Destination IP address for event packets.
Event Destination Port 0 to 65535 1234 Destination UDP Port Number for event packets.
Event Stream Id 0 to 2147483647 1000 Stream ID for event packets. If the packet format is
IENA, only the least significant 16 bits will be used.
Event Packet Format iNetX
IENA iNetX Select the format of event packets.
SETUP DATA CHOICE DEFAULT NOTES

SSR/CHS/001
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Event IENA Trailer 0 to 65535 57005 Only used if packet format is IENA, in which case this
specifies the final 16 bits of the packet.
Settings
IENA ---
Fragmentation True
False False IENA packages bigger than 1,500 bytes are frag-
mented into smaller packages.
Processes - - -
Filtering(16:1) - -
Specify streams which will be blocked from being
sent from the SSR/CHS/001, although they will still
be recorded. Note that only streams addressed to
multicast addresses can be filtered.
Settings
Filtering --
Ethernet Output Filter. Operates on multicast packets
specified by stream ID.
Stream Id 00 to FFFFFFFF FFFFFFFF
Stream ID used to select packets to which this filter
applies. Only streams addressed to multicast
addresses are allowed.
Fixed-Word(1023:0) - - Process to facilitate fixed parameter definitions.
Settings - - -
Fixed Value 0000 to FFFF DEAD Value specifying the fixed data to be transmitted in
the fixed-word parameter.
Channels - - -
GPS-In
GPS Input --TheGPSinput.
Settings - - -
Ethernet
Ethernet bi-directional - - The standard Ethernet interface.
Settings - - -
PPSOut
TTL Output - - Pulse per second.
Audio-In(1:0)
Audio Input - - Two audio input channels on the device.
Settings
Packetizer ---
Packetizer Format iNET-X
IENA iNET-X Hybrid iNET-X Selects the packetizer header format for all channels.
Stream Id 00 to FFFFFFFF FFFFFFFF
iNET-X stream identifier for selected channel if a
packet is generated via the assertion of Packetization
Enabled. This is a conditional setting and is only
active when the Packetizer Format is set to iNET-X.
IENA Key 0 to FFFF 0
IENA Key for selected channel if a packet is gener-
ated via the assertion of Packetization Enabled. This
is a conditional setting and is active when the Pack-
etizer Format is not set to iNET-X.
Packetization Enabled True
False False
Enables the transmission of a packetizer packet con-
taining the contents of this channel if a packetizer
transmitter or memory module is present in the chas-
sis.
SETUP DATA CHOICE DEFAULT NOTES

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Parameter definitions
Packetization Sink
All
Controller Only
Slot 1
Slot 2
Slot 3
Slot 4
All Selects which modules the packetizer package will
be sent to for transmission or storage.
IRIG-B-In
IRIG-B Input - - The IRIG-B time source input.
RecorderStatus
TTL Output --
The status of the recorder. High indicates an error
condition.
NAME/DESCRIPTION BASE UNIT DATA FORMAT BITS REGISTER DEFINITION
Global Parameters
DayOfYear
Day of Year, February first is day
32
BitVector BitVector 16
R[15:0]
R[15:10] Reserved - Reserved for future use.
R[9:0] DayOfYear - Day of Year 1 to 366.
IrigTime48
48-bit wide IRIG time word. BitVector BitVector 48 R[47:0]
TimeHi
Hours and minutes at the start of
the acquisition cycle.
BitVector BitVector 16
R[47:32]
R[15:13] Reserved - Reserved for future use.
R[12:7] Hours - BCD Hours 0 to 23.
R[6:0] Minutes - BCD Minutes 0 to 59.
TimeLo
Seconds and centiseconds at
the start of the acquisition cycle.
Second BCD 16
R[31:16]
R(15) Reserved
R[14:8] Seconds - Seconds 0 to 59.
R[7:0] Centiseconds - Centiseconds 0 to 99.
TimeMicro
Microseconds at the start of the
acquisition cycle.
Second BCD 16 R[15:0]
R[15:0] Microseconds - Microseconds 0 to 9999.
StatusTimer
IRIG-B and timer status register. BitVector BitVector 16
R[15:0]
R(15) IRIG-BLock - When 1 the IRIG-B decoder is
locked to a valid IRIG-B stream.
R(14) StraightBinarySeconds - Bit 16 (MSB) of the
Straight Binary Seconds decoded from the IRIG-B
stream (see StraightBinarySeconds for bits 15 to 0).
R[13:3] Reserved
R(2) SourcePrimary - When 1 the timer is locked to
the primary timer source.
R(1) TimerLock - When 1 the timer's PLL is in lock
with the input TIME ONE_PPS source.
R(0) BatteryFail - When 1 power-on test fails (battery
voltage is not present or real time clock is not run-
ning).
SETUP DATA CHOICE DEFAULT NOTES

SSR/CHS/001
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Report
Report status of module. BitVector BitVector 16
R[15:0]
R(15) Event - Event occurred since last read.
R(14) Time Jump - This value is asserted when the
time has been adjusted by a jump.
R(13) Reserved - Reserved for future use.
R(12) Reserved - Reserved for future use.
R(11) Ethernet Link Down - Ethernet Link Down.
R[10:9] Reserved - Reserved for future use.
R(8) Invalid configuration - The module has been pro-
grammed with an EPROM image that cannot pro-
duce a valid acquisition cycle.
R(7) Rx Error - Unexpected Ethernet frame received.
An Ethernet frame was received which was invalid in
some way. This may indicate a problem with the net-
work.
R(6) Rx Overflow - Ethernet receive buffer overflow.
The module is receiving packets faster than they can
be processed. Packets which can cause this include
those addressed to the broadcast MAC address, the
module's own MAC address, or the PTP multicast
MAC address.
R(5) Reserved - Reserved for future use.
R(4) Module Reset - Watchdog timeout. A 1 here
indicates that the module's microprocessor has
failed and has been reset by the internal watchdog
timer.
R[3:2] Reserved - Reserved for future use.
R(1) Time Source Lost - Missed more than five con-
secutive PTP packets.
R(0) Out Of Sync - On the last update the measured
time error relative to the time master was greater
than the value specified by the Synchronisation Level
setting.
PTPTimeError
2's complement value giving the
difference between the Time
sent by the Time Master, which
may be a PTP Grandmaster or a
TCG, and the BCU’s PTP Time
measured in nanoseconds.
BitVector BitVector 16
R[15:0]
R[15:0] PTPTimeError - Current value of the Time
Error register.
TypeNumber
Type number of the module BitVector BitVector 16 R[15:0]
StatusRecorder
Recorder status register. BitVector BitVector 16
R[15:0]
R[15:10] Reserved - Reserved for future use.
R(9) LoggingStatus - When 1 the recorder is logging
data packets.
R(8) MediaAvailable - When 1 the media is available
for recording.
R[7:0] DiskFill - Percentage disk fill, binary encoded
0x00 to 0x64 (0-100%).
NAME/DESCRIPTION BASE UNIT DATA FORMAT BITS REGISTER DEFINITION

SSR/CHS/001
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StatusEventNumber
Recorder Event Number status. BitVector BitVector 16
R[15:0]
R[15:12] Reserved - Reserved for future use.
R[11:0] EventNumber - Current recorder event num-
ber, binary encoded decimal, 000-999.
Filtering(16:1) Parameters
Fixed-Word(1023:0) Parameters
Fixed-Word
Parameter containing fixed data. BitVector BitVector 16 R[15:0]
GPS-In Parameters
StatusGPS
GPS status register. BitVector BitVector 16
R[15:0]
R(15) GPSLock - When 1 the GPS decoder is locked
to a valid NMEA stream.
R(14) FixError - When 1 indicates that the Fix Flag
was not set R(15)=0.
R(13) CheckSumError - When 1 indicates that a
checksum error was detected R(15)=0.
R(12) ToFewSatellites - When 1 indicates that less
than the minimum configured number of satellites are
used, which can affect the quality of the received
data.
R(11) DOPTooHigh - When 1 indicates that one of the
DOP (Dilution of Precision) figures is outside a speci-
fied range.
R(10) NorthSouth - When 0 the latitude read is in the
northern hemisphere; when 1 the latitude read is in
the southern hemisphere.
R(9) East/West - When 0 the longitude read is east of
the Greenwich Meridian; When 1 the longitude read
is west of the Greenwich Meridian.
R(8) Reserved
R[7:4] SattellitesInView - Number of satellites in view.
R[3:0] SatellitesInUse - Number of satellites used to
calculate GPS solution.
Latitude
Latitude received in the NMEA
stream.
BitVector BitVector 48 R[47:0]
LatitudeHi
Degrees and minutes of latitude. BitVector BitVector 16
R[47:32]
R[47:40] Degrees - Degrees of latitude 0 to 89.
R[39:32] Minutes - Minutes of latitude 0 to 59.
LatitudeLo
Decimal minutes of latitude. BitVector BitVector 16
R[31:16]
R[31:16] DecimalMinutes - Decimal places of min-
utes of latitude 0.0000 to 0.9999.
LatitudeMicroMinutes
Fifth decimal place of minutes of
latitude.
BitVector BitVector 16
R[15:0]
R[15:4] Reserved
R[3:0] DecimalMinutes - Fifth Decimal place of min-
utes of latitude 0.00000 to 0.00009.
Longitude
Longitude received in the NMEA
stream.
BitVector BitVector 48 R[47:0]
NAME/DESCRIPTION BASE UNIT DATA FORMAT BITS REGISTER DEFINITION

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SSR/CHS/001
NOTE: It is recommended that names are less than 20 characters, have no white space or contain any of the following five char-
acters "/><\.
LongitudeHi
Degrees of Longitude. Unitless BCD 16
R[47:32]
R[47:44] Reserved
R[43:32] Degrees - Degrees of longitude 0 to 179.
LongitudeLo
Minutes and decimal minutes of
longitude.
Unitless BCD 16
R[31:16]
R[31:24] Minutes - Minutes of longitude 0 to 59.
R[23:16] DecimalMinutes - Decimal places of min-
utes of longitude 0.00 to 0.99.
LongitudeMicroMinutes
Decimal minutes of longitude. Unitless BCD 16
R[15:0]
R[15:12] Reserved
R[11:0] DecimalMinutes - Last three decimal places
of minutes of longitude 0.00000 to 0.00999.
Altitude
Altitude expressed as height
above Mean Sea Level (MSL).
Meter BitVector 32 R[31:0]
AltitudeHi
Tens of thousands of meters. Unitless BCD 16
R[31:16]
R[31:20] Reserved
R[19:16] Altitude - Tens of thousands of meters 0 to 9.
AltitudeLo
Thousands of meters. Unitless BCD 16 R[15:0]
R[15:0] Altitude - Meters 0 to 9999.
VelocityInKph
Velocity in kilometers per hour. Unitless BCD 16 R[15:0]
R[15:0] VelocityInKph - KM 0 to 9999.
VelocityInKn
Velocity in nautical miles per hour.
Unitless BCD 16 R[15:0]
R[15:0] VelocityInKn - KN 0 to 9999.
Heading
True course over ground. BitVector BitVector 32 R[31:0]
HeadingHi
Degrees of true course over
ground.
BitVector BitVector 16
R[31:16]
R[31:28] Reserved
R[27:16] Degrees - Degrees 0 to 359.
HeadingLo
Decimal degrees of true course
over ground
BitVector BitVector 16
R[15:0]
R[15:8] Reserved
R[7:0] DecimalDegrees - Decimal degrees of true
course over ground.
DilutionOfPrecision
Dilution of precision. BitVector BitVector 16
R[15:0]
R[15:12] Reserved
R[11:8] PDOP - Positional DOP; if DOP >15 then 15
is returned.
R[7:4] HDOP - Horizontal DOP; if DOP >15 then 15 is
returned.
R[3:0] VDOP - Vertical DOP; if DOP >15 then 15 is
returned.
IRIG-B-In Parameters
ControlFunction
Control Function (CF) bits
received from the IRIG-B input.
BitVector BitVector 32
R[31:0]
R[31:5] ControlFunction
R[5:0] Reserved
StraightBinarySeconds
Straight binary count of seconds
in day.
Second OffsetBinary 16
R[15:0]
R[15:0] StraightBinarySeconds - LSBs of the 17
straight binary seconds bits received from the IRIG-B
input (see StatusIn(14) for the MSB, bit 16).
NAME/DESCRIPTION BASE UNIT DATA FORMAT BITS REGISTER DEFINITION

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Getting the most from the SSR/CHS/001
SMA torque setting
The recommended torque setting for the SMA connector is 0.45 Nm (0.33 foot pound-force).
Recording with the SSR/CHS/001
The SSR/CHS/001 is live on power-on; data is acquired and packetized instantly.
At any time, move the START/STOP switch to the start position to record, or move it to the stop position to stop recording. (The
START/STOP switch is a locked position switch and must be pulled away from the panel to flip.) For further details see the Multi-
role Recorders User Guide.
The SSR/CHS/001 stops recording when the media is full. There is a wrap-around-when-full setting to continue recording after
deleting the oldest file. You can modify this setting via SNMP. For SNMP settings see TEC/NOT/058 - Overview of SNMP and using third
party SNMP tools.
One of the optimization features of the SSR/CHS/001 is aperiodic transmission where packets are generated only if traffic has
been captured on a given bus. For example, in MIL-STD-1553 busses are asynchronous and there may be times when the traffic
rate is low. MIL-STD-1553 packets are only generated when there is a full payload of data or a timeout occurs making the
recording of MIL-STD-1553 traffic very efficient.
File format
The SSR/CHS/001 constantly generates the data to be recorded as Ethernet packets. When the START/STOP switch is in the
start position, these packets are stored in a FAT32 volume using the Wireshark PCAP file format (see the following figure).
For more information on the PCAP file format and FAT32, see TEC/NOT/051 - Ethernet frames, Wireshark® and FAT32.
Storage media
Use only those CompactFlash cards validated and approved for use with SSR/CHS/001s. For details of approved cards, see the
CompactFlash cards data sheet.
Figure 3: CompactFlash card as viewed by Windows® XP
Front panel status LEDs
Two LEDs are located on the front panel of the SSR/CHS/001. The ERROR LED lights yellow when recording is not possible; the
LOGGING LED lights green when recording is taking place. For monitoring purposes, the REC_STATUS pin on the rear-
mounted I/O connector signals the status of the ERROR LED.
The absence of an active Ethernet connection is not considered an error condition which would cause the Error LED to light.

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NOTE: Status LEDs dim in conjunction with the LCD display brightness. See “External control of the screen brightness” on
page 20.
Front panel display
The date, time, status, and utilization of the CompactFlash card are displayed on the front of the recorder (see the following
figure).
Figure 4: Display of the SSR/CHS/001
The housing of the SSR/CHS/001 is designed to provide a wide viewing angle for the display.
Figure 5: Wide viewing angle
When the SSR/CHS/001 is installed but is not recording data, the data rate seen by the recorder is shown on the bottom right of
the display as a percentage of the 40 Mbps nominal logging speed (see the following figure). For example, if the recorder is
receiving 30 Mbps, including data from modules and data from Ethernet, the display shows 75%. If the module is receiving 70
Mbps, the display shows 175%; since this is greater than 100%, some incoming data would be lost if recording was to be
started.
NOTE: This calculation is based purely on the data rate and assumes that the packet size is sufficiently large to achieve
40 Mbps logging speed.
Figure 6: Display showing percentage of nominal logging speed
If an error prevents the SSR/CHS/001 from recording, for example if no CompactFlash card is available, then the incoming data
rate is not measured. When the data rate cannot be measured or is less than 1%, it is not displayed.
NOTE: The LCD is not damaged by exceeding the temperatures stated in “General specifications” on page 2. However, at
extreme temperatures, for example below -30° or above 70°, the visibility of the display is reduced.
Understanding power consumption in the SSR/CHS/001
An empty SSR/CHS/001 typically consumes 8.4W. An SSR/CHS/001 unloaded, analog bridge module on average takes 150 mA
on the 5V line (150 mA x 5V = 0.75W), 50 mA on the ±7V lines ((50 mA x 7) x 2 = 0.7W) and 60 mA on the ±12V lines ((60 mA x 12)
Pilot
Pilot
DISPLAY

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x 2 = 1.44W). The efficiency of the PSU (75%) means that an SSR/CHS/001 module consumes on average 3.85W (total Power:
0.75W + 0.7W + 1.44W = 2.89W. 2.89W/0.75 = 3.85W.) Therefore a fully loaded SSR/CHS/001 consumes a total of 23.8W
((3.85W x 4) + 8.4W = 23.8W). For more information, see TEC/NOT/049 - Power estimation.
Battery backup
When the SSR/CHS/001 is switched off, the battery backup of the RTC continues. The RTC maintains an accuracy of ± two
minutes per year. The battery has a 4-year lifetime, after which you can replace it. For information on how to replace the battery,
see the Multi-role Recorders User Guide.
NOTE: In 1% of power-on situations the recorder can power on with an incorrect time from the RTC. This can be corrected by
power cycling the recorder, or is corrected automatically if the unit is receiving time from an external source.
SNMP
Once installed the SSR/CHS/001 is configured using DAS Studio 3 via the Ethernet port. DAS Studio 3 uses SNMP to edit the
configuration of the SSR/CHS/001. These settings include:
•The IP address of the SSR/CHS/001.
•The current year when used with an IRIG time source.
The following table outlines the core subset of SNMP variables that can be used to configure the SSR/CHS/001.
TABLE 15 Variable descriptions
VARIABLE DESCRIPTION READ ONLY (RO)
READ AND WRITE (R/W)
.ipSetVar.0 Combined MAC address, IP address, and IP mask. RO, R/W
.iso.org.dod.internet
.private.enterprises.
acra.triggers.recorde
rTriggers
.triggerRemoteEvent.0 Event increment variable: writing 1 to this variable increments the
event number; reading from this variable returns the current event
number.
R/W
.iso.org.dod.internet
.private.enterprises.
acra.recorder
.recCommand.0 Issue a command to control the recorder or retrieve the last command
issued when queried. (0) no command - no command has been
received (default), (1) record - starts the recording function, (2) stop -
stops the recording function, (3) mount - mounts the media for r/w
access, (4) dismount - dismounts the media in preparation for
removal. Recorder must be in the idle state for this command to be
valid.
R/W
.controlMethod.0 Method of controlling the recorder. Only the control method listed in
this variable controls the recorder with the exception that the
controlMethod variable itself is always modifiable with SNMP. (0) local
- controlled by front panel, (1) remote - controlled over the network via
SNMP, (2) external - controlled via wires on the I/O interface.
R/W
.ethernetRecording.0 Enable/disable the Ethernet-in recording. R/W
.iso.org.dod.internet
.private.enterprises.
acra.display
.brightness.0 LCD brightness. RO

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External control of the screen brightness
The brightness level of the display can be controlled by an input voltage level to the 19-pin I/O connector. The brightness of the
screen increases linearly with the level of the voltage. The absolute brightness levels can be mapped to a voltage level using
DAS Studio 3 or SNMP within a range of -10V to 10V.
Control of these limits is achieved using the display.brightnessBrightMode and display.brightnessDimMode SNMP
variables. The range of these SNMP variables is 0-100 and they map to voltages corresponding to the following formula:
Voltage = (variable - 50) / 5
For example, as shown in the following table, 0V could be mapped to 0% brightness; 5V mapped to 100% brightness. The front
panel status LEDs dim in conjunction with the LCD display brightness. When setting screen brightness, ensure it is adequate for
the status LEDs to be seen.
KAD/ADC/005 family of modules
The SSR/CHS/001 does not support programming of modules in the KAD/ADC/005 family, for example the KAD/ADC/006,
KAD/ADC/009, KAD/CDC/001 and KAD/LDC/001. For a list of all KAD/ADC/005 family modules, contact Curtiss-Wright support
([email protected]).
.brightnessBrightMode LCD brightness. R/W
.brightnessDimMode LCD brightness. R/W
TABLE 16 Voltage-to-SNMP brightness mapping
EXAMPLE VOLTAGE LEVEL INPUT RANGE (V) CORRESPONDING SNMP VARIABLE SETTING
0% brightness 100% brightness brightnessDimMode brightnessBrightMode
0 5 50 75
-5 5 25 75
0 1050100
-10 10 0 100
TABLE 15 Variable descriptions (continued)
VARIABLE DESCRIPTION READ ONLY (RO)
READ AND WRITE (R/W)