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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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BI-DIRECTIONAL VIDEO, AUDIO AND DATA LINK UNIT CMX 831 (VERSION G)
Figure 1. CMX 831
1) Unit status LED alarms
10) Audio Ch1/Ch2 connections
2) Video status LEDs
11) Data Configuration (A & B)
3) Audio status LEDs
12) Data Ch1/Ch2 connections
4) Data status LEDs
13) Current loop configuration
5) Current loop status LEDs
14) Current loop connections
6) Video input and output connectors, BNC
15) Grounding connection
7) Optical connector, FC/PC
16) Mains voltage connector for power cord
8) Unit configuration switches
17) Mounting pieces for 19 inch frame installation
9) Audio configuration switches
Connector type in positions 10, 12 and 14 is a removable screw terminal
CAUTION!
THIS OPTICAL UNIT USES CLASS 1 LASER DIODE. DO NOT STARE INTO BEAM OR VIEW
DIRECTLY WITH OPTICAL INSTRUMENTS. APPLICABLE STANDARD IEC825-2: 1993
NOTE:
VERSION CHANGE
THIS INSTALLATION INSTRUCTION IS VALID FROM THE VERSION G ONWARDS
(SEE TYPE LABEL OF THE UNIT).
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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GENERAL
The CMX 831 is a bi-directional, digital single channel optical transceiver for video surveillance, monitoring and
remote controlled systems. The unit can be installed into standard 19-inch installation cabinet. Stand-alone installation directly to a wall is also possible.
SETTINGS BEFORE INSTALLATION
The unit has several settings for video, audio, data and current loop/contact closure operations that must be
defined by internal DIP switches before installation. See the separate paragraphs for each setting.
Note!
Although the unit can be taken in use with default factory settings, the MASTER/SLAVE setting must
always be determined to guarantee the basic link operation.
INSTALLATION
The module is secured with the locking screws (4 pcs) to a 19-inch installation cabinet. For free circulation of
cooling air, leave at least 1U high space above the unit. The supply voltage range is 85...264V AC (47...440 Hz)
and the unit is connected to a mains outlet by separate power cord CPC 121 (Europe), CPC 122 (UK) or CPC
123 (US).
In stand-alone installation the unit can be mounted to e.g., a wall, through the two holes at the top of the unit.
Maximum diameter of the fixing screw is 8 mm. In a wall installation, the front panel should face in an upward
direction.
VIDEO INDICATORS, CONNECTIONS AND SETTINGS (ALSO GENERAL SETTINGS)
The CMX 831 has separate connections for incoming and outgoing baseband video signals. The impedance of
the baseband video input (BNC) can be switched internally to 75 ohm or high impedance operation, by the
means of the DIP switches. The nominal input and output level is 1 Vpp.
LED
Video Input & Output
FUNCTION
Video Input 75 ohm
Video Input high Z
Master
Slave
Normal Operation
Local Loopback Enable
Laser ON
Laser OFF
COLOUR
Yellow
Green
Blinking Yellow
1
ON
OFF
2
STATUS
Signal <0.15V
Signal detected
Overload
3
4
The default factory settings are:
Master, Normal Operation,
Laser On and Video Input 75 Ω.
ON
OFF
ON
OFF
ON
OFF
Master/Slave: Each link must have the master unit and the slave unit. Master/Slave configuration error is shown
with LED displays (see LINK STATUS AND UNIT FAIL INDICATORS).
Local Loopback: all signals inserted to unit are digitally looped back to outputs of the same unit (Video in to
Video out, Audio in to Audio out, Data Ch 1 to Data Ch 2). This can be used for testing the operation of the unit.
Laser OFF: the optical output is shutdown and the modulating signal in laser drive stage is muted (only for e.g.
testing purposes).
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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AUDIO INDICATORS, CONNECTIONS AND SWITCH SETTINGS
Two audio channels for bi-directional transmission are available. The nominal input and output level is 0 dBm.
The connectors are of the removable screw terminal type. The audio inputs can be switched to balanced or unbalanced and the input impedance ( between input +/- ) to 600 Ωor high impedance. The audio outputs can be
also connected either to balanced or unbalanced. The output impedance can be switched to 600 Ωor low impedance. Alarms signals, as well as control inputs, are located in the same connectors (open collector).
AUDIO INDICATORS
LED
COLOUR
Audio
Green
Inputs
Blinking Yellow
1&2
Audio
Green
Outputs
Blinking Yellow
1&2
STATUS
Level
>0 dBm
Overload >12 dBm
Level
>0 dBm
Overload >12 dBm
AUDIO 1 CONNECTION
PIN
SIGNAL
1
Ch1 audio ground
2
Ch1 audio input 3
Ch1 audio input + or unbalanced input
4
A alarm -> Hardware failure alarm
5
B1 alarm -> Link status alarm
6
Ch1 audio output 7
Ch1 audio output + unbalanced output
8
Ch1 audio ground
NOTE
Open collector, 14V / 10 mA
Open collector, 14V / 10 mA
AUDIO 2 CONNECTION
PIN
SIGNAL
1
Ch2 audio ground
2
Ch2 audio input 3
Ch2 audio input + or unbalanced input
4
B2 alarm / control 2 -> Video input alarm
5
B3 alarm / control 1 -> Video output alarm
6
Ch2 audio output 7
Ch2 audio output + unbalanced output
8
Ch2 audio ground
AUDIO DIP SWITCHES
Audio Config. Mode
Balanced Input
Unbalanced Input
Input 600 ohm.
Input High Z
Output 600 Ω
Output Low Z
AUDIO 1
1
2
OFF
ON
3
NOTE
Open collector, 14V / 10 mA
Open collector, 14V / 10 mA
AUDIO 2
5
6
OFF
ON
4
ON
OFF
7
8
ON
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
ON
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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DESCRIPTION OF AUDIO DIP-SWITCHES:
1
2
3
4
5
6
ON = audio 1 input ( - ) to ground
ON = 600 Ωtermination is selected
in audio 1 input
ON = audio 1 ( - ) output low impedance,
ON = audio 1 ( + ) output low impedance,
ON = audio 2 input ( - ) to ground
OFF = audio 1 ( - ) output 600 Ω
OFF = audio 1 ( + ) output 600 Ω
7
ON = 600Ωtermination is selected
in audio 2 input
ON = audio 2 ( - ) output low impedance,
OFF = audio 2 ( - ) output 600 Ω
8
ON = audio 2 ( + ) output low impedance,
OFF = audio 2 ( + ) output 600 Ω
Non-inverted or unbalanced output or input = +
Inverted output or input =
-
*The default factory settings are: Balanced Input, Input 600 Ω, Output 600 Ω
DATA INDICATORS, CONNECTIONS AND SWITCH SETTINGS
Two (RS-422/485, TTL) or four (RS-232) data channels are available for bi-directional transmission.
The connectors are of the removable screw terminal type.
DATA INDICATORS
LED
Data inputs 1 & 2
Data outputs 1 & 2
DATA 1 CONNECTIONS
PIN
RS-232
1
Data ground
2
Input 1
3
Input 3
4
Data Ground
5
Output 1
6
Output 3
7
Temperature
Alarm Output
8
Alarm Ground
COLOUR
Green
Yellow
Green
Yellow
STATUS
Data “0”
Data “1” or NC
Data “0”
Data “1”
RS-422 / RS-485
Data Ground
Ch1 Non-inverted (+) input
Ch1 Inverted (-) input
Data Ground
Ch1 Non-inverted (+) output
Ch1 Inverted (-) output
-> Temperature Alarm
TTL
Data Ground
Ch1 Input
Data Ground
Ch1 Output
(Open Collector,
14V / 10 mA )
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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DATA 2 CONNECTIONS
PIN
RS-232
1
Data ground
2
Input 2
3
Input 4
4
Data ground
5
Output 2
6
7
8
Output 4
External Resistor: Input A
External Resistor: Input B
RS-422/485
CH1
2
6
CH1
5
1, 4, 8
2
Data 1
3
CH1
2
6
CH1
5
5
CH2
6
7
8
CH3
3
2
6
CH1
CH3
2
6
5
CH1
5
CH2
5
7
External resistor ( RS-485 )
1, 4
8
External resistor ( RS-485 )
1, 4
Vref
CH1
CH1
1, 4, 8
Data 2
3
CH2
Data 1
1, 4, 8
2
TTL
3
Data 2
6
Ch2 output
Data 1
Data 2
CH2
Ch2 input
Data ground
RS-232
1, 4, 8
3
TTL
Data ground
RS-485
Data 1
3
RS-422 / RS-485
Data Ground
Ch2 Non-inverted (+) input
Ch2 Inverted (-) input
Data Ground
Ch2 non-inverted (+) output
Ch2 inverted (-) output
Data 2
3
CH4
3
2
CH2
2
6
CH4
6
5
CH2
5
7
7
8
8
1, 4
1, 4
Vref
CH2
CH2
Figure 2. Data Interface Connections
DATA DIP-SWITCHES
Data Config.
Mode
RS-232
TTL
RS-422
RS-485 short time*)
RS-485 long time**)
RS-422/485 line bias
RS-422/485 no line bias
RS-422/485 term
RS-422/485 no term
Data Config. A
CH1
CH2
1
2
3
ON ON ON
OFF ON OFF
OFF ON OFF
ON OFF ON
OFF OFF OFF
4
ON
ON
ON
OFF
OFF
Data Config. B
CH1
1
2
3
OFF OFF OFF
OFF ON OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
CH2
4
5
6
OFF OFF OFF
OFF OFF ON
OFF
OFF
OFF
ON
OFF
ON
OFF
7
OFF
OFF
8
OFF
OFF
ON
OFF
ON
OFF
*) CH1: 0.3 ms, CH2: 1.2 ms, **) CH1: 1.2 ms, CH2: 10 ms
(CH2 10 ms time constant is adjustable by external resistor, more details can be found in a separate application
note, which is available on request).
Note! The default factory setting is RS-232.
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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DESCRIPTION OF DATA DIP-SWITCHES
Data Config A
1, 2 Data Mode Selection
3, 4 Data Mode Selection
( channel 1 )
( channel 2 )
Data Config B
1 Line Termination of Channel 1
2 Voltage Reference of TTL
3, 4 Line Bias of RS-422/485 Input
5 Line Termination of Channel 2
6 Voltage Reference of TTL
7, 8 Line Bias of RS-422/485 Input
( 120 Ω
)
( Channel 1 )
( 660 Ω
, channel 1 )
( 120 Ω
)
( Channel 2 )
( 660 Ω
, Channel 2 )
+ 5V
+ 5V
660 Ω
47
kΩ
120 Ω
660 Ω
Databuffer
47 kΩ
Figure 3. Line bias and fail safe
implementation in RS-422/485.
SETTING EXAMPLE:
RS485 (short time) with termination and line bias in Channel 1
Data Config A
CH1
1
2
ON
OFF
CH2
3
Data Config B
CH1
1
2
ON
OFF
4
3
ON
4
ON
CH2
5
6
7
8
Note! The default factory setting for DATA is RS-232.
Tim ing sequence
Tx is enabled
when data is low
T IM E
(m s)
0
1.2
2.4
starts from low to
high transition
3.8
5.0
6.2
C M X 831
data input
1.2 m s
T x enabled
C M X 831
T x enable
T x disabled
C M X 831
data output
Rx
enabled
TX high-Z
Rx
enabled
TX high-Z
Figure 4. Timing Diagram
(for more information on timing sequence adjustment, see separate application note, which is available on request)
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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Video Networks
CURRENT LOOP/CONTACT CLOSURE INDICATORS, CONNECTIONS AND SETTINGS
Two channels for current loops or contact closure lines are available. The current loops can be switched to either active or passive mode (max. current 20 mA). The connector is a removable screw terminal type connector.
INDICATORS
LED
CL/CC Inputs 1 & 2
C LOOP/CC Outputs 1 & 2
COLOUR
Green
Green
STATUS
Current Active/Contact Closed
Current Active/Contact Closed
CONNECTIONS
C LOOP 1
PIN
SIGNAL
1
Data Ground
2
C LOOP Input +
3
C LOOP Input 4
Contact Closure Output A
( 24 VDC / 1A )
5
Contact Closure Output B
( 24 VDC / 1A )
6
C LOOP Output +
7
C LOOP Output 8
Data Ground
C LOOP 2
PIN
1
2
3
4
5
6
7
8
SIGNAL
Data Ground
C LOOP Input +
C LOOP Input Contact Closure Output A
( 24 VDC / 1A )
Contact Closure Output B
( 24 VDC / 1A )
C LOOP Output +
C LOOP Output Data Ground
DIP-SWITCHES
MODE
C LOOP In Active
C LOOP In Passive
C LOOP Out Active
C LOOP Out Passive
Relay Output Enable
Relay Output Disable
1
CHANNEL 1
2
3
ON
OFF
ON
OFF
4
5
CHANNEL 2
6
7
ON
OFF
8
ON
OFF
ON
OFF
ON
OFF
DESCRIPTION OF DIP-SWITCHES
1
ON = C LOOP Driver is Active in ch1, (20 mA internal current source is selected )
2
C LOOP Receiver is Active (= ON), or Passive (= OFF) in ch1
3
ON = Relay 1 is Active (controlled by ch1 )
4
Not Used
5
C LOOP Driver is Active (= ON), or Passive (= OFF) in ch2
6
C LOOP Receiver is Active (= ON) or Passive (= OFF) in ch2
7
ON = Relay 2 is Active (controlled by Ch 2)
8
Not Used
The default factory settings are C LOOP in Passive, C LOOP out Active, and Relay Output Disable.
When the current loop is active, the current is generated in CMX 831. In passive mode, the terminal equipment
generates the current. See the figure on next page for pin information.
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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Figure 5. Connection examples for CLOOP and Contact Closure Operation.
FIBRE CONNECTION
The optical connection is an FC/PC type connector. The fibre patch cables used must fullfill the minimum return
loss requirement of 30 dB (Angled-PC connectors recommended). When installing the fibre optic cable, do not
exceed the minimum bending radius when connecting the cable to the system.
Note! For correct optical operation, ensure that all optical connectors are cleaned immediately before mating.
Connectors should always be cleaned using high-purity alcohol (e.g. methyl or isopropyl alcohol).
Dry the surfaces using clean compressed air or other equivalent pressurised gas. The optical connectors on the
equipment should always be protected with dustcaps when there is no fibre inserted.
DIP-SWITCHES LOCATION
All DIP switches are located on the back panel of the unit is the following order as shown below.
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INSTALLATION INSTRUCTION
CMX 831
November 27, 2000
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LINK STATUS AND UNIT FAIL INDICATORS
Unit Fail LED
Red
Condition
Laser Bias
Failure
PLL Fail
(only effective when
Link Status is OK)
Reason
• temperature too high
• unit failure
• temperature too high
• unit failure
Link Status
LED
Yellow
Condition
Reason
Action
Optical Input Low
• remote unit is off
Yellow (Blinking)
Bad Sync
Green&Yellow
(Blinking)
Config. Error
Green
(Blinking)
Some Errors
• optical budget exceeded or
too high optical
reflections
• both units are masters
• both units are slaves
• optical reflection loopback
from disconnected fibre
• near to optical budged or too
high optical reflections
•
•
•
•
Green
Link OK
Red (Blinking)
alarm B1 activated
outputs muted
alarm B1 activated
outputs muted
• alarm B1 activated
• Outputs muted (except when
Local Loopback test mode is
selected).
• data outputs not updated
during errors
• contact outputs not updated
during errors
• all functions are normal
Output muting has the following effects: video forced to low, data output forced to “1”, audio output muted and
contacts forced to open.
ALARM OUTPUTS
All alarms at the back connector of the unit are low open collector outputs, with the capability of 14 V/10 mA
switching (see paragraphs AUDIO/DATA INDICATORS, CONNECTIONS... for pin information).
Alarm
A
B1
B2
B3
TEMP
Description
• Hardware failure alarm
• PLL fail (only effective when Link Status is OK)
• Link status alarm
• Optical input level is low
• Master/Slave configuration error
• Video input alarm
• Video output alarm
• Temperature alarm (internal temp. too high)
Possible causes
• laser bias alarm
• No video input
• no video signal received from link
• Operation temp. range exceeded
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