CML Microcircuits EV9720 User manual

CMLMicrocircuits
COMMUNICATIONSEMICONDUCTORS
EV9720
Evaluation Kit
User Manual

2013 CML Microsystems Plc
UM9720/1 March 2013 Provisional Issue
Features
CMX972 Quadrature 20-300MHz
Demodulator
C-BUS Interface to Host µC
Options for on-chip PLL or External LO
Sources
Easy Interfacing to PE0601-xxx
1 Brief Description
The EV9720 is an Evaluation Kit designed for evaluating and demonstrating the capabilities of the
CMX972 integrated circuit. All the circuits necessary to demonstrate the facilities provided by the IC, such
as matching circuits, power supply regulators, etc are provided on the EV9720 board. Note that as the
EV9720 shares a common pcb with the EV9730, the pcb will not be fully populated.
A C-BUS interface connector is provided for control of the EV9720 by a host microcontroller or CML
PE0002 interface card.

Evaluation Kit for CMX972 EV9720
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CONTENTS
Section Page
1Brief Description ..................................................................................................1
2Block Diagram......................................................................................................4
3Preliminary Information.......................................................................................5
3.1 Laboratory Equipment...............................................................................5
3.1.1 Power Supply...............................................................................5
3.1.2 Control Interface...........................................................................5
3.2 Handling Precautions................................................................................5
3.2.1 Static Protection...........................................................................5
3.2.2 Contents - Unpacking...................................................................5
3.3 Approvals ..................................................................................................5
4Quick Start............................................................................................................6
4.1 Hardware/Software Installation (for PE0002)............................................6
4.2 First –Initial Setup - EV9720 Quadrature IF Demodulator .......................6
4.2.1 Make External Connections and Apply Power.............................6
4.3 Second –Configure - EV9720 Quadrature IF Demodulator.....................7
4.3.1 EV9720 Configuration..................................................................7
4.4 Third –Operate - EV9720 Quadrature IF Demodulator............................8
5Signal Lists...........................................................................................................9
6Circuit Schematics and Board Details .............................................................13
7Detailed Description ..........................................................................................15
7.1 Hardware Description..............................................................................15
7.1.1 Quadrature IF Demodulator.......................................................15
7.1.2 Oscillator....................................................................................15
7.1.3 Reference Oscillator...................................................................15
7.1.4 Power Supply.............................................................................15
7.2 PC Control Software Description ............................................................16
7.2.1 The C-BUS Control Tab.............................................................17
7.2.2 The Registers Tab .....................................................................18
7.2.3 The Registers 2 Tab ..................................................................18
7.2.4 The Script Handler Tab..............................................................19
7.3 Evaluation Tests......................................................................................21
7.3.1 Quadrature IF Demodulator.......................................................21
7.4 Troubleshooting ......................................................................................23
7.4.1 General ......................................................................................23
7.4.2 Quadrature IF Demodulator Operation ......................................23
7.4.3 PLL/VCO Operation...................................................................24
8Performance Specification................................................................................25
8.1 Electrical Performance............................................................................25
8.1.1 Absolute Maximum Ratings .......................................................25
8.1.2 Operating Limits.........................................................................25
8.1.3 Operating Characteristics...........................................................26
Table Page

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Table 1 Signal List.........................................................................................................................................9
Table 2 C-BUS Interface.............................................................................................................................10
Table 3 Quadrature Demodulator Output Connector..................................................................................11
Table 4 Jumpers/Links................................................................................................................................11
Table 5 Test Loops and Points ...................................................................................................................11
Table 6 Possible General Errors.................................................................................................................23
Table 7 Possible Quadrature IF Demodulator Errors..................................................................................23
Table 8 Possible PLL/VCO Errors...............................................................................................................24
Figure Page
Figure 1 EV9720 Block Diagram...................................................................................................................4
Figure 2 USB Driver Installation Message Box.............................................................................................6
Figure 3 Typical Connections for EV9720 as a Quadrature IF Demodulator................................................7
Figure 4a PCB Layout: top..........................................................................................................................13
Figure 5 Reset Dialog Box ..........................................................................................................................16
Figure 6 Product Selection Dialog Box........................................................................................................16
Figure 7 The CBUS Control Tab.................................................................................................................17
Figure 8 The Registers Tab ........................................................................................................................18
Figure 9 The Registers 2 Tab .....................................................................................................................19
Figure 10 The Script Handler Tab...............................................................................................................20
Figure 11 I/Q Output Signals.......................................................................................................................21
Figure 12 I/Q Signal to Noise Measurement...............................................................................................22
History
Version
Changes
Date

1
First Issue
20/3/13
It is always recommended that you check for the latest product datasheet version from the
Datasheets page of the CML website: [www.cmlmicro.com].

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2 Block Diagram
sin
cos
IFIN
RXIP
RXIN
RXQP
RXQN
Integer-N
PLL
VCO
RXLO Divide
by
2 or 4
REFIN
DO
VCON2
VCON1
VCOP1
VCOP2
External
Resonator &
Varactors
DC
Offset
Adj.
DC
Offset
Adj.
Control
Registers
C-BUS C-BUS
Interface (J7)
OA1P
OA1N
OA1O
OA2P
OA2N
OA2O
RXI/RXQ
(J8)
KEY
Interface Connector
Coax Connector
19.2MHz
VCTCXO
J1
REFIN
Regulator
Regulator
J6
Power VIN
VSS
J5
IF_IN
J3
LO_IN
TL2
TL1
J4
LO_IN_2
CMX972
Figure 1 EV9720 Block Diagram

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3 Preliminary Information
3.1 Laboratory Equipment
The following laboratory equipment is recommended for use with this Evaluation Kit:
Power Supply
Spectrum Analyser
Signal Generator(s)
Oscilloscope
Digital Multi-meter
For more detailed design or investigation work, additional RF test equipment may be required.
3.1.1 Power Supply
The supply input voltage to the PCB is nominally 7.2V (3.6V to 7.6V acceptable). On board
regulators are provided to generate all voltage rails used on the PCB (3.3V). The 7.2V supply
should be rated at 200mA.
NOTE: Care should be exercised with the supplies as they are not protected for reverse polarity.
Operation at 12V will exceed the power dissipation ratings of the internal regulators.
3.1.2 Control Interface
To use the EV9720, the user will need a mechanism to send and receive data and commands via
the C-BUS host microcontroller interface on the CMX972, which is brought out on connector J7.
The CMX972 datasheet gives details of the registers and commands.
A PE0002 Interface Card (not supplied) can be used to control the EV9720. A user interface
program developed specifically for the EV9720 is available from the CML website (see
www.cmlmicro.com for details). Use of this GUI is described later in this document.
3.2 Handling Precautions
In common with other Evaluation Kits, this product is designed for use in office and laboratory
environments. The following practices will help ensure its proper operation.
3.2.1 Static Protection
This product uses low power CMOS circuits that can be damaged by electrostatic discharge.
Partially damaged circuits can function erroneously, leading to misleading results. Observe ESD
precautions at all times when handling this product.
3.2.2 Contents - Unpacking
Please ensure that you have received all of the items detailed on the separate information sheet
(EK9720) and notify CML within 7 working days if the delivery is incomplete.
3.3 Approvals
This product is not approved to any EMC or other regulatory standard. Users are advised
to observe local statutory requirements, which may apply to this product and the radio
frequency signals that may emanate from it.

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4 Quick Start
This section provides instructions for users who wish to experiment immediately with the EV9720
Evaluation Kit. A more complete description of this kit and its use appears later in this document.
The user should read the CMX972 datasheet before using this kit.
4.1 Hardware/Software Installation (for PE0002)
Copy the file ‘ES9700xx.zip’, which is downloaded from the CML website following
registration, to the hard drive of your host PC.
Extract the files to the hard drive of your host PC.
Connect a 5V dc supply to the PE0002 Interface.
Connect a 7.2V dc supply to the EV9720.
Attach a USB cable from connector J2 of the PE0002 Interface Card to the PC USB port.
Turn on the power supply to the PE0002. The PE0002 power-on indicator D6 will light
Install the USB driver when requested. The driver is in the same folder where the
‘ES9700xx.zip’ files were extracted to, in directory ‘.\Driver’. Follow instructions on the
screen to install the USB driver. Click the ‘Continue Anyway’ button when the Message Box in
Figure 2 is shown.
Figure 2 USB Driver Installation Message Box
4.2 First –Initial Setup - EV9720 Quadrature IF Demodulator
4.2.1 Make External Connections and Apply Power
An example of typical connections to the EV9720 is shown in Figure 3. Perform the following steps
in sequence:
1. Connect test leads as shown in Figure 3, except the power to J6.
2. Connect a controller to C-BUS interface J7 (PE0002 can be used - see section 4.1. Note: J3
or J5 can be used on PE0002, but ensure the correct C-BUS port is selected when
programming data).
3. Install PE0002 hardware/software and apply power to PE0002 - see section 4.1.
4. Power should be applied to the main supply input J6 (7.2V nominal). The CMX972 device will
be reset on power-up.
The board is now ready for operation.

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Oscilloscope
-
-
CMX972
J5
J3
EV9720
J8
J8 PE0002
USB
Connection
to PC
C-BUS
J3 (or J5)
J7
J6
+7.2V
GND
+5V
GND
I/Q Signals
(e.g. 2kHz sine waves)
-
J2
RF Signal
Generator (LO)
Flo
(e.g. 180 MHz)
RF Signal
Generator (Signal)
Frf
(e.g. 45.002 MHz)
Figure 3 Typical Connections for EV9720 as a Quadrature IF Demodulator
4.3 Second –Configure - EV9720 Quadrature IF Demodulator
In this second step the EV9720 Quadrature Demodulator is configured for receive operation at
45MHz input frequency.
4.3.1 EV9720 Configuration
The following steps should be undertaken to configure the EV9720 to receive at 45MHz with an
I/Q output. Set the applied signals and register values as shown in the following table.
Note: Setting the CMX972 registers requires the use of the PE0002 host connected as above.
The CMX972 datasheet give details of the registers and commands.

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Signal or
Register
Setting
Note
LO_IN (J3)
180MHz @-10dBm
This frequency is four times the RF input
frequency.
IF_IN
(J5)
45.002MHz
The input level here may be user defined: for
example an input signal of –60dBm at J5 the
typical single ended output level would be
220mVp-p at J8 pin 2. The output should be 2kHz
sine and cosine waves on I and Q when the
configuration in this table is completed.
General
Reset
register
($1A)
To ensure the device and
hardware are in known
states issue the General
Reset command
See lower right of GUI tab “C-BUS Control”.
General
Control
register
($1B)
The General Control
register should be set to
enable the following:
Bias generator
Rx
Select Rx LO/4 mode.
Write $12 to register $1B.
Rx Control
register
($1C)
Set Rx Gain to maximum,
output drive to low and
phase correction circuit off.
Write $00 to register $1C, this enables maximum
gain, with low output drive capability and no phase
correction. This gives the lowest power
consumption mode.
Rx Mode
register
($1D)
Enable I and Q outputs.
The general purpose op-
amps are enabled/disabled
in this register.
Write $00 to register $1D, op-amps disabled.
Write $30 to register $1D, op-amps enabled.
Rx Offset
register ($1F)
The value written to this
register will vary between
devices, the default value
($00) is a good starting
point.
Check the dc levels on J8 (I and Q) to ensure that
the dc offsets are less than 25mV; adjust the
value written to $1F as required.
VCO Control
register ($2F)
For initial testing the default
value ($00) can be used so
there is no need to write to
this register.
The value written to this register can be adjusted
to give the optimal intermod (IMD) performance,
see CMX972 datasheet for further details.
RXI/Q (TL1
and TL2)
Single ended Rx I/Q output.
The single ended I and Q signals can be taken
from TL1 and TL2 if the jumper/links are fitted to
J8. Ensure op-amps are enabled in register $1D.
RXI/Q
(J8)
Differential Rx I/Q output.
The differential I and Q signals can be taken from
J8, remove jumpers when using the differential
output.
4.4 Third –Operate - EV9720 Quadrature IF Demodulator
Following the configuration procedures given in sections 4.2 and 4.3, the EV9720 should be
operating as a receiver at 45MHz. Various evaluation tests can now be performed.

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5 Signal Lists
The input power supply connection is via a 2-way snap socket J6. J2, J3 and J5 are RF signals and use
SMA 50 Ohm sockets. J8 is a 10-pin header for differential RXI/RXQ modulation outputs from the
demodulator. These connectors can interface signals easily to the PE0601-xxx Evaluation Kit.
The PCB will be configured with jumper links fitted to J8. This converts the differential demodulator output
signals to single ended outputs, available on test loops, using the on chip general purpose op-amps.
Signal
Signal
Type
PCB
Connector
Ground
DC
J6 Pin 1
+Vin (7.2V nominal)
DC
J6 Pin 2
Quadrature Demodulator RF input
RF
J5
Local Oscillator RF input 1
RF
J3
Local Oscillator RF input 2 (optional)
RF
J4 (PCB pads)
Reference Clock input (optional). To use this
input C4 needs to be fitted to the PCB and C3,
R1 removed.
RF
J1 (PCB pads)
Differential Quadrature Demodulator outputs
Baseband
J8
Single ended Quadrature Demodulator outputs
Baseband
TL1 (RXI)
TL2 (RXQ)
C-BUS interface (e.g. to PE0002)
Logic
J7
Table 1 Signal List
Connections to the host C-BUS interface J7 are as follows. All are 3.3V logic levels unless otherwise
stated.

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CONNECTOR PINOUT for J7
Connector
Pin No.
Signal
Name
Signal
Type
Description
1
-
-
Spare pin. Leave unconnected.
2
CSN
I/P
C-BUS Chip Select.
3
-
-
Spare pin. Leave unconnected.
4
CDATA
I/P
C-BUS Data Input.
5
-
-
Spare pin. Leave unconnected.
6
SCLK
I/P
C-BUS Clock.
7
-
-
Spare pin. Leave unconnected.
8
RDATA
O/P
C-BUS Data Output
9
-
-
Spare pin. Leave unconnected.
10
IRQN
I/P
Interrupt request - if required.
Not used, so remains unconnected on EV9720.
11
GNDD
Power
Connection to Digital Ground.
12
GNDD
Power
Connection to Digital Ground.
13
-
-
Spare pin. Leave unconnected.
14
-
-
Spare pin. Leave unconnected.
15
-
-
Spare pin. Leave unconnected.
16
-
-
Spare pin. Leave unconnected.
17
-
-
Spare pin. Leave unconnected.
18
-
-
Spare pin. Leave unconnected.
19
-
-
Spare pin. Leave unconnected.
20
-
-
Spare pin. Leave unconnected.
Table 2 C-BUS Interface

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The differential output I/Q signals from the demodulator (interface connector J8) are described in Table 3,
along with the connections for single ended I/Q outputs, by using the general purpose op-amps, in Table 4.
CONNECTOR PINOUT for J8
Connector
Pin No
Signal Name
Signal
Type
Description
2
RXI+
Baseband
Positive Rx I Output
4
RXI-
Baseband
Negative Rx I Output
8
RXQ+
Baseband
Positive Rx Q Output
10
RXQ-
Baseband
Negative Rx Q Output
1
OA1N
Baseband
Negative I/P to Differential Amplifier 1
3
OA1P
Baseband
Positive I/P to Differential Amplifier 1
7
OA2N
Baseband
Negative I/P to Differential Amplifier 2
9
OA2P
Baseband
Positive I/P to Differential Amplifier 2
5,6
GNDA
-
Ground (Analogue)
Table 3 Quadrature Demodulator Output Connector
JUMPERS/LINKS
Test Point
Ref.
Positions
Default
Description
JP1
1-2
1-2
+3V3D
JP2
1-2
1-2
+3V3A
RXI+, J8
1-2
1-2
Connect RXI+ to differential to signal ended amplifier
RXI-, J8
3-4
3-4
Connect RXI- to differential to signal ended amplifier
RXQ+, J8
7-8
7-8
Connect RXQ+ to differential to signal ended amplifier
RXQ-, J8
9-10
9-10
Connect RXQ- to differential to signal ended amplifier
Table 4 Jumpers/Links
TEST LOOPS/POINTS
Test Point
Ref.
Typical
Value
Description
TL1
-
RXI Single ended output
TL2
-
RXQ Single ended output
TL3
0V
GNDA
TL4
0V
GNDD
TP1
1.6V
VCTCXO Control Voltage
TP2
3.3V
VDD –CMX972 Digital Supply Pin
TP3
-
Tuning voltage for the PLL
TP4
3.3V
+3V3 regulator output (+3V3D - digital supplies)
TP5
3.3V
+3V3 regulator output (+3V3A - analogue supplies)
TP6
-
C-BUS connector: IRQN
TP7, 8, 9,
10
-
Test points to spare pins on J9
Table 5 Test Loops and Points

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Notes: I/P = Input BI = Bidirectional
O/P = Output TL = Test Loop TP = Test Point
Note that the voltages are typical for their active state.
As the EV9720 shares a common pcb with the EV9730, the pcb will not be fully populated. In particular,
connectors J2, J9, along with trimpot VR1, are not fitted. The pcb pads for J4 are underneath the board.

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6 Circuit Schematics and Board Details
For clarity, circuit schematics are available as a separate high-resolution file available from the CML
web site as part of the support files package. The layout on each side is shown in Figure 4, below.
The PCB is a 4-layer design fabricated with FR4 material and is 1.6mm thick. Full Gerber and Drill
files are available on request.
Figure 4a PCB Layout: top

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C37
R37
C13
R6
C8
R10
C11
L1
R9
R40
C14
L3
R20
R14
C10
R5
R39
R38
C15
C9 R15
R16
LO_IN_2
J4
R36
R41
C7
220
119
65.9 mm
70.000 mm
Figure 4b PCB Layout: bottom

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7 Detailed Description
The CMX972 datasheet (available from www.cmlmicro.com) should be referred to for a detailed
description of the CMX972 device.
The EV9720 functionality includes:
Evaluation and demonstration of the CMX972 Quadrature IF demodulator
VCO, Integer-N PLL and divider
19.2MHz VCTCXO
Interface to CMX7163 or CMX7164 evaluation boards (PE0601-7163/PE0601-7164, not
included) to allow demonstration/test of QAM and 2-FSK/4-FSK demodulation.
An interface that allows the card to be connected to a host µController, to allow real-time
control. A PC user interface can be provided using a PE0002 and ES9700 software.
If further design support is required, please contact your regional CML office or an approved CML
distributor.
7.1 Hardware Description
7.1.1 Quadrature IF Demodulator
The Evaluation Kit is configured to allow the CMX972 Quadrature Demodulator to operate over a
broad range of input frequencies (20 to 300MHz) i.e. no matching has been applied at the IFIN
input (L2, C16 and C18). Matching can be applied to the IFIN input; this will increase the gain,
improve the noise figure and degrade the IIP3.
The RxLO input (L3, C13 and C14) can be used with an external source and there is no matching
on this input so a broad range of LO frequencies can be applied.
The RXI/RXQ outputs can be accessed differentially for direct connection to a PE0601-xxx kit, for
example, or the general purpose op-amps on the CMX972 can be used to convert the Rx outputs
from differential to single ended. Jumpers need to be fitted to J8 when using the op-amps (see
Table 4 for details of jumper positions).
7.1.2 Oscillator
The EV9720 provides components to use the VCO amplifier and PLL contained within the
CMX972 device. As supplied, the resonator circuit (L4, C21, C20, C25, D1, D2) is configured for
180MHz operation with a tuning sensitivity of approximately 8MHz/V. The oscillator is usable up to
about 1GHz, for further details consult the CMX972 datasheet.
The component values used for the PLL loop filter provide a bandwidth of approximately 500Hz for
a comparison frequency of 25kHz. The loop filter is a passive 3rd order type. The user may change
the values dependent upon the comparison frequency spur suppression, lock time and operating
frequency requirements.
The Quadrature Demodulator can make use of the internal VCO by ensuring the correct LO path
has been selected (see CMX972 datasheet).
7.1.3 Reference Oscillator
A 19.2MHz VCTCXO (U1) is provided on the PCB. This is specified as a 1.5ppm part over –20 to
+70°C. If C3 and R1 is removed and C4 (1nF) fitted, an alternative clock source can be applied to
J1.
7.1.4 Power Supply
Two 3.3V regulator supplies are generated on the PCB. U3 provides supply for digital circuits and
U4 for analogue circuits. Current drawn from each supply rail may be measured by connecting an
ammeter across JP1 (digital) or JP2 (analogue), after removing the corresponding jumper.

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7.2 PC Control Software Description
The EV9720 itself does not require any embedded firmware, however, it does require C-BUS
control from an external microcontroller. The CML product, PE0002, can be used with the EV9720
and PC software files (‘ES9700xx.zip’). To use the software, connect the EV9720 as shown in
Figure 3. First ensure the drivers supplied for the PE0002 are installed correctly. The executable
must be in the same folder on the PC as the ‘EF0002xx.hex’file. Run the ES9700xx.exe and
the main application window will open with a request for the Reset button to be pressed on the
PE0002 board, see Figure 5. The window then displays a progress bar for the initialisation stage.
Figure 5 Reset Dialog Box
This software is common to a number of Evaluation Kits, so the appropriate kit must then be
selected in a new dialog box, see Figure 6.
Figure 6 Product Selection Dialog Box

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Once the initialisation and kit selection process is complete, one of four tabs can be selected, as
shown in Figure 7 to Figure 10. The four tabs represent a particular set of registers or a particular
function of the CMX972. To select a tab simply click on the corresponding name in the row at the
top of the program window. Setting or clearing the check box associated with a bit of a register will
cause that bit to be set or cleared when the register is next written to. If the ‘Auto Write’ check box
is set a register will be written whenever a check box or list box associated with it is modified. This
removes the need to click the ‘Write’ button associated with that register. The program can be
closed at any time by clicking the ‘Close’ button or by pressing ‘Alt’ and ‘F4’ keys simultaneously.
7.2.1 The C-BUS Control Tab
The C-BUS Control Tab allows the user to read from or write to any register or to issue a General
Reset command, see Figure 7. The C-BUS header which is used can also be selected on this tab.
Figure 7 The CBUS Control Tab
To perform a General Reset on the CMX972, either the Gen. Reset button can be clicked or a
single write can be made to register $1A. The following script (see section 7.2.4), which may be
used with the ES9700xx software, is recommended:
;General Reset.pes
;This script will send a C-BUS General reset.
;Reset C-BUS (assigns register RESET a zero length parameter to get a single 8-bit write)
;format: register <device (1 or 2)> <C-BUS address> <# parameter bytes (0 to 2)>
RESET const $1A
register 1 RESET 0
copy 0 *RESET

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;If using C-BUS port 2 then use the following lines
; register 2 RESET 0
; device 2
; copy 0 *RESET
7.2.2 The Registers Tab
The Registers tab gives the user access to the general control, Rx control and Rx mode registers,
see Figure 8. Note that registers can be written to individually or as a whole mass register write
(“Write All”in the bottom left hand corner of window). If Auto Write is checked, the register is
changed as the user makes changes to the register window.
Figure 8 The Registers Tab
7.2.3 The Registers 2 Tab
The Registers 2 tab gives the user access to the Rx Offset, VCO Control and PLL Divider
Registers, see Figure 9. Note that registers can be written to individually or as a whole mass
register write (“Write All” in the bottom left hand corner of window). If Auto Write is checked, the
register is changed as the user makes changes to the register window.
The PLL M/R Divider register window has a box which indicates the PLL lock detect states. The
lock detect is read each time the PLL divider values are written and the status updated. The box
will be blank to indicate PLL is out of lock and when the PLL is in lock the box will have an L in it.

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Figure 9 The Registers 2 Tab
7.2.4 The Script Handler Tab
The Script Handler Tab allows the execution of script files consisting of register write, read, and
delay commands, see Figure 10. These are plain text files on the PC, which are compiled via the
GUI but executed by the E2 Microprocessor on the PE0002 board. The script language is
documented separately in the “Script Language Reference” document, which can be downloaded
with the PE0002 support package from the CML website. Control of the EV9720 does not require
the use of script files.

Evaluation Kit for CMX972 EV9720
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2013 CML Microsystems Plc 20 UM9720/1
Figure 10 The Script Handler Tab
To select a script file, click on the ‘Select Script’ button. The Open File Dialog is displayed. Browse
and select the script file. The folder that contains the script file will be the working folder of the
script (i.e. all the files referenced in the script will be searched in this folder). Alternatively, select a
script file from the recent files list. Click on the ‘>’ button to display the list.
The results window displays the values returned by the script. These results can be saved to a text
file or discarded by clicking on the ‘Save Results’ or ‘Clear Results’ buttons, respectively. When a
script file is being executed the ‘Run Script’ button will change to become the ‘Abort’ button, the
rest of the tab will be disabled and the other tabs cannot be selected.
After a script has finished running and when trace data is available, the ‘See Trace…’ button will
be enabled. Up to 131072 C-BUS transactions can be logged in the PE0002 board. Click in the
‘See Trace…’ button to display the Trace dialog box. Note that the C-BUS transactions are only
logged if the feature has been enabled in the script. See the “Script Language Reference”
document for details.