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CB-7000 is a family of network data acquisition and control modules. They provide A/D, D/A, DI/O,
Timing/Counting and other functions. These modules can be remote controlled by a set of commands.
The common features of the CB-7080 and CB-7080D include:
Two independent 32-bit counters, counter 0 and counter 1.
Input signals can be isolated or non-isolated.
Programmable digital filter for isolated and non-isolated input.
External gate control for isolated and non-isolated input.
Programmable threshold value for non-isolated input.
Programmable alarm output.
Input frequency measurement up to 100 kHz.
The CB-7080D module identical to the CB-7080 with a 5-digit LED display added. The LEDs can display the
counter value and input signal frequency without PC control.
Comparing the 7080 and 7080D
Table 1-1 summarizes the features of the CB7080 and CB7080D modules.
Table 1-1. Comparison between CB-7080 and CB-7080D
5-digit LED display No Yes
Response to LED command No Yes
Module name programmable programmable
Counter preset value Yes (programmable) Yes (programmable)
Alarm on counter 0 only Yes (programmable) Yes (programmable)
Alarm on counter 0 and 1 Yes (programmable) Yes (programmable)
Channel 0 and channel 1 are both non-
isolated (input mode 0, $AAB0)
Channel 0 and channel 1 are both
isolated (input mode 1, $AAB1)
Channel 0 is non-isolated and channel
1 is isolated (input mode 2, $AAB2)
Channel 0 is isolated and channel 1 is
The pin names and locations on the CB-7080D module are shown in Figure 1-1.
Figure 1-1. CB-7080D pin identification
Specifications
CB-7080 Counter/Frequency Module
CB-7080D CB-7080 with LED Display
Counter Input Channels Two independent 32 bit counters, counter 0 and 1.
Input signal Isolated or non-isolated programmable
Isolation input levels:
Logic level 0 +1 V max
Logic level 1 +3.5 V to +30 V
Isolation voltage 3750 V RMS
Non-isolation input threshold level: Programmable
Logic level 0 0 to +5 V (default = 0.8 V)
Logic level 1 0 to +5 V (default = 2.4 V)
Maximum count 32 bit (4,294,967,295)
Programmable digital noise filter
Alarming alarm on counter 0 or counter 0 and 1, programmable
Counter preset value Programmable
Display LED Indicator 5-digit read out, channel 0 or channel 1
Frequency measurement
Input frequency 1 Hz to 100 kHz max
Programmable built-in gate time 1.0 or 0.1 sec
Perform the following procedure to measure the counter input. Refer to Figure 1-5 for the wire connection.
1. Power on and run the
2. Press
3. Press
4. Press
5. Press
6. Press
7. Press
8. Press
9. Press
2
$012
[Enter] Receive=!01500600
2
$01B0
[Enter] Receive=!01
2
#010
[Enter] Receive=>????????
2
#011
[Enter] Receive=>????????
test.exe
application.
In step 3: The status of CB-7080 is COUNTER mode
In step 5: Select non-isolated input
In step 7: Counter measurement of channel-0
In step 9: Counter measurement of channel-1
Note:
The command $01B1 can be used in step 5 to select the isolated inputs. The commands $01B2 and $01B3 are
used for the other input mode selections.
Default settings
CB-7080 and CB-7080D default settings are listed in Table 1-2.
Table 1-2. Default Settings
Address 01
Baud rate 9600
Checksum disabled
Data bits 1 start + 8 data + 1 stop (no parity)
Type 50 (counter input)
Alarm
CB-7080: High alarm on counter 0 and counter 1
CB-7080D High/High-High alarm on counter 0
Application notes
Counter/Frequency input mode selection
Select the counter/frequency input from either isolated or non-isolated signal inputs. Channel 0 and channel 1
can be selected separately. Four different input modes are listed in the following table. These four input
modes can be used in both the CB-7080 and the CB-7080D.
Frequency mode D/O 0 D/O 1
Counter mode and alarm disabled D/O 0 D/O 1
Counter mode and alarm enable
(alarm mode 1, ~AAA1)
Counter mode and alarm enable (alarm
mode 0, ~AAA0 and @AAEA0)
Counter mode and alarm enable (alarm
mode 0, ~AAA0 and @AAEA1)
D/O 0 D/O 1
High alarm on counter 0 High-High alarm on counter 0
Alarm on counter 0 D/O 1 or alarm on counter 1
D/O 0 or alarm on counter 0 alarm on counter 1
Programmable threshold voltage setting
The programmable threshold voltage is valid for a non-isolated input of counter mode (50) and frequency
mode (51). The default settings are:
TTL compatible
Low trigger level = 0.8 volt
High trigger level = 2.4 volts
You can change the high trigger level by the $AA1H (data) command. The low trigger can be changed by the
$AA1L (data) command. The high trigger level must be greater than the low trigger level.
Digital filter setting
The digital filter is disabled in frequency mode (51). It is designed as a pulse-width filter for both high/low
pulses, and is valid for both non-isolated and isolated inputs. The digital filter can be enabled or disabled. Key
points of digital filter usage include:
1. Use $AABS to select the input signal.
2. Use $AA0H(data) to set the minimum width of high level.
3. Use $AA0L(data) to set the minimum width of low level.
4. Use $AA4S to enable/disable the digital filter (both channels).
If the high width of the input signal is smaller than the minimum high width of digital filter, the input signal is
filtered out. Also, the low width of the input signal must be greater than the minimum low width of digital
filter.
For example, if the width of the input signal is >1000 µs, set the digital filter at 900 µs. Therefore, all noise
<900 µs is filtered out by the digital filter. These steps are given as follows:
The gate control is ignored in frequency mode (51). The gate control is disabled in counter mode (50) by
default. Use the following commands to enable/disable the gate control:
When you use the $AAA0 command, the gate input must be low to enable the counter.
When you use the $AAA1 command, the gate input must be high to enable the counter.
When you use the $AAA2 command, the gate input is disabled. The counter is
always enabled.
Preset value setting
The preset value is ignored in frequency mode (51). The counters go to their preset value in the first power-on
state. The reset counter command, $AA6N, also forces the counters to go to their preset value. The default
preset value is 0. Use the $AAPN(data) command to change the preset value. The key points include:
Table 1-5: Preset values
Factory default setting Counter preset value is 0
Power on state Counters 0/1 are set to the preset value
$AA6N Counter N is set to the preset value
$AAPN(data) Sets the preset value of counter N
Frequency input applications
To set the module to frequency mode set the configuration code to 51in the Set module configuration
command.
Table 1-6. Frequency mode settings
Command Result - Frequency 0 Result - Frequency 1
$AAB0 to set input mode 0
$AA1H(data) and $AA1L(data)
$AAB1 to set input mode 1
$AAB2 to set input mode 2
$AA1H(data) & $AA1L(data)
$AAB3 to set input mode 3
$AA1H(data) & $AA1L(data)
To measure frequency:
1. Use the $AA1H(data) and $AA1L(data) commands to set the threshold voltage values, if the frequency
input is a non-isolated input.
2. Use the $AAB? command to select the mode (this command will clear the current frequency first).
3. Use the #AA? command to perform frequency measurement.
Only four commands are important in frequency measurement mode:
$AAB? Select mode
$AA1H(data) Set high-level threshold value
$AA1L(data) Set low-level threshold value
#AA? Perform frequency measurement
Non-isolated channel 0 and
threshold voltage values active
Isolated channel 0 Isolated channel 1
Non-isolated channel 0 and
threshold voltage values active
Isolated channel 0 Non-isolated channel 1 and
Non-isolated channel 1 and
threshold voltage values active
Isolated channel 1
threshold voltage values active
The status-read-back commands are:
$AAB? Mode read back
$AA1H High_level threshold value read back
$AA1L(data) Low_level threshold value read back
To set the module to frequency mode set the configuration code to 50 in the Set module configuration
command
Table 1-7. Counter mode settings
$AAB0 to set input mode 0
$AA1H(data) and $AA1L(data)
$AAB1 to set input mode 1
$AAB2 to set input mode 2
$AA1H(data) and $AA1L(data)
$AAB3 to set input mode 3
$AA1H(data) and $AA1L(data)
Note:
Counter 0 Counter 1
Non-isolated channel 0 and
threshold voltage values active
Isolated channel 0 Isolated channel 1
Non-isolated channel 0 and
threshold voltage values active
Isolated channel 0 Non-isolated channel 1 and
Non-isolated channel 1 and
threshold voltage values active
Isolated channel 1
threshold voltage values active
The threshold voltage value commands $AA1H(data) and $AA1L(data) are effective for non-isolated inputs
only.
Configuration Codes
Use the configuration codes listed in the following tables to set or read back the baud rate, the status , and the
input type configuration codes of a module.
Table 1-9. Status Configuration Code: FF, 2-char (for all)
7 6 5 4 3 2 1 0
0 checksum
0=disabled
1=enabled
TT Input Range
50 Counter
51 Frequency
0 0 0 frequency gate time
0: 0.1 second
1: 1.0 second
Table 1-10. Input Type Configuration Code: TT
0 0
1-10
Command Set
Overview
The commands in this section are grouped by function, and summarized as listed below.
Table Function Description
Table 2-1 General Command s
Table 2-2 Frequency Command s
Table 2-3 General Counter
Commands
Table 2-4 Alarm Mode 0
Commands
Table 2-5 Alarm Mode 1
Commands
Table 2-6 LED Commands
Read a module's name, status, firmware number and init pin
Read/write a module's configuration
Read or enable the watchdog timer
Set or read the input mode and trigger levels of a module
Set or read counter input settings of a module
Used in two-channel applications to set a different alarm mode for
each channel.
Used in two-channel application to set the same alarm mode for each
channel.
Get or set LED configuration
To send data to the LED
2
General syntax format
Commands are constructed with individual pieces of information represented as code. Each command is
structured as follows:
One-character Delimiter that indicates the type of command to execute.
Two-character HEX module address, from 00 to FF
Function, which indicates the task to execute.
Terminator character, to indicate the end of the command.
This section lists the commands to use to perform specific functions. When writing a command, replace the
generic address with the address of the module you want to perform the task on. For example, to read the name of module 1:
Select $AAM, the command used to read the name of a module (see page 35).
1. Replace the address (AA) with 01, to indicate module 1.
2. Terminate the command with a carriage return (cr).
This command would then be written as $01M(cr).
2-1
CB-7080 & CB-7080D Counter/Timer User's Guide General syntax format
Delimiter characters
The characters %, #, ~, %, $, @ are used as the leading character in a command. These characters indicate the
type of command to execute.
Delimiter Character Usage
% Set the configuration of a module.
#
~ Reset the data.
$ Get/set (read/write) module information.
[ ] Characters inside [ ] indicate optional code characters, such as [chk]
(cr) Indicates the end of the command.
! Always the leading character in the response to a command.
General Commands
Table 2-1. General Command Set
Command Response Description Reference
%AANNTTCCFF !AA Set the module configuration Page 2-4
#AAN >(data) Read the counter or frequency Page 2-1
~** No Response Host OK Page 2-2
~AA0 !AASS Read the module status Page 2-3
~AA1 !AA Reset the module status Page 2-4
~AA2 !AATT Read the Host Watchdog Timer Page 2-5
~AA3ETT !AA Enable the Host Watchdog Timer Page 2-6
~AAO(name) !AA Set the module name Page 2-8
$AA2 !AATTCCFF Read the module configuration Page 2-17
$AAF !AA(data) Read the firmware number Page 2-33
$AAI !AAS Read the value of INIT* pin Page 2-34
$AAM !AA(data) Read the module name Page 2-35
Frequency commands
Table 2-2. Frequency Command Set
Command Response Description Reference
$AAB !AAS Read the input mode Page 2-31
$AABS !AA Set the input mode Page 2-32
$AA1H !AA(data) Read the high trigger level Page 2-13
$AA1H(data) !AA Set the high trigger level Page 2-14
$AA1L !AA(data) Read the low trigger level Page 2-15
$AA1L(data) !AA Set the low trigger level Page 2-16
General counter commands
Table 2-3. General Counter Command Set
Command Response Description Reference
~AAAS !AA Set the counter alarm mode Page 2-7
$AA0H !AA(data) Read the minimum width of High Page 2-9
$AA0H(data) !AA Set the minimum width of High Page 2-10
$AA0L !AA(data) Read the minimum width of Low Page 2-11
$AA0L(data) !AA Set the minimum width of Low Page 2-16
$AA1H !AA(data) Read the high trigger level Page 2-13
$AA1H(data) !AA Set the high trigger level Page 2-14
2-2
CB-7080 & CB-7080D Counter/Timer User's Guide General syntax format
Command Response Description Reference
$AA1L !AA(data) Read the low trigger level Page 2-15
$AA1L(data) !AA Set the low trigger level Page 2-16
$AA3N !AA(data) Read the max. counter value Page 2-18
$AA3N(data) !AA Set the max. counter value Page 2-19
$AA4 !AAS Read the filter status Page 2-20
$AA4S !AA Set the filter status Page 2-21
$AA5N !AAS Read the counter status Page 2-22
$AA5NS !AA Set the counter status Page 2-23
$AA6N !AA Reset the counter Page 2-24
$AA7N !AAS Read the overflow status Page 2-25
$AAA !AAG Read the gate control mode Page 2-29
$AAAG !AA Set the gate control mode Page 2-30
$AAB !AAS Read the input mode Page 2-31
$AABS !AA Set the input mode Page 2-32
@AADI !AAS0D00 Read the D/O and alarm state Page 2-36
@AADO0D !AA Set the D/O value Page 2-38
@AAGN !AA(data) Read the preset value Page 2-44
@AAPN(data) !AA Set the preset value Page 2-45
Alarm mode 0 commands
Table 2-4. Alarm-mode 0 Command Set
Command Response Description Reference
@AAEAN !AA Enable the alarm Page 2-39
@AADAN !AA Disable the alarm Page 2-43
@AAPA(data) !AA Set the counter 0 alarm value Page 2-46
@AASA(data) !AA Set the counter 1 alarm value Page 2-48
@AARP !AA Read the counter 0 alarm value Page 2-50
@AARA !AA Read the counter 0 alarm value Page 2-52
Alarm mode 1 commands
Table 2-5. Alarm-mode 1 Command Set
Command Response Description Reference
@AAEAT !AA Enable the alarm Page 2-40
@AACA !AA Clear the latch alarm Page 2-41
@AADA !AA Disable the alarm Page 2-42
@AAPA(data) !AA Set the Hi-alarm value Page 2-46
@AASA(data) !AA Set the Hi-Hi-alarm value Page 2-48
@AARP !AA Read the Hi-alarm value Page 2-51
@AARA !AA Read the Hi-Hi-alarm value Page 2-53
LED commands
Command Response Description Reference
$AA8 !AAS Read LED configuration Page 2-26
$AA8V !AA Set LED configuration Page 2-27
$AA9(data) !AA Send data to LED Page 2-28
Reads the module status. The module status will be latched until ~AA1 command is sent. If the
host watchdog is enabled and the host is down, (no ~** command received), the module status will be set to 4.
If the module status=4, all output commands are ignored.
Syntax:
~AA0[chk](cr)
~ A delimiter character
AA 2-character HEX module address, from 00 to FF
[chk] 2-character checksum. If checksum is disabled, no [chk]
(cr) 0x0D
Response
:
Valid response !AASS[chk](cr)
Invalid response ?AA[chk](cr)
No response Syntax error, communication error or address error
! A delimiter character indicating a valid response
? A delimiter character indicating an invalid response
AA 2-character HEX module address
SS 2-character HEX status value:
Bit_0, Bit_1 = reserved
Bit_2 = 0: OK,
1: host watchdog time-out
[chk] 2-character checksum. If checksum is disabled, no [chk]
(cr) 0x0D
Examples
:
Status of module 01 is OK:
Command: ~010(cr)
Response: 0100(cr)
Module status=04; host watchdog timed-out; HOST is down now:
Resets the module status. The module status will be latched until ~AA1 command is sent. If the
module status=4, all output commands will be ignored. Read the module status first to verify that the module
status is 0. If the module status is not 0, only a ~AA1 command can clear the module status.
Syntax
: ~AA1[chk](cr)
~ A delimiter character
AA 2-character HEX module address, from 00 to FF
[chk] 2-character checksum If checksum is disabled, no [chk]
(cr) 0x0D
Response
:
Valid response !AA[chk](cr)
invalid response ?AA[chk](cr)
No response: Syntax error, communication error or address error
! A delimiter character indicating a valid response
? A delimiter character indicating an invalid response
AA 2-character HEX module address
[chk] 2-character checksum. If checksum is disabled, no [chk]
Reads the status and timer value of host watchdog. When the host watchdog is enabled, the host
must send ~** command to all modules before the timer times-out. When the ~** command is received, the
host watchdog timer is reset and starts counting down. Use ~AA3ETT to enable/disable/setting the host
watchdog timer.
Syntax:
~AA2[chk](cr)
~ A delimiter character
AA 2-character HEX module address, from 00 to FF
[chk] 2-character checksum. If checksum is disabled, no [chk]
(cr) 0x0D
Response
:
Valid response AASTT[chk](cr)
invalid response ?AA[chk](cr)
no response Syntax error, communication error or address error
! A delimiter character indicating a valid response
? A delimiter character indicating an invalid response
AA 2-character HEX module address
S=0 Host watchdog is disabled
S=1 Host watchdog is enabled
TT 2-character HEX value, from 00 to FF, unit=0.1 second
[chk] 2-character checksum. If checksum is disabled, no [chk].
(cr) 0x0D
Examples
:
Host watchdog timer of module 01 is disabled
command: ~012(cr)
response: !01000(cr)
Host watchdog timer of module 02 is enabled and time-out
time = 0.1 x 10 = 1 second
Enable/disable the timer value of host watchdog. The host watchdog timer is a software host
watchdog. When the software host watchdog is enabled, the host must send ~** command to all modules
before the timer times-out. When the ~** command is received, the host watchdog timer is reset and restarted.
Use ~AA2 to read the host watchdog status and value.
Syntax
: ~AA3ETT[chk](cr)
~ A delimiter character
AA 2-character HEX module address, from 00 to FF
E 0 is disabled and 1 is enabled
TT 2-character HEX value, from 00 to FF, unit=0.1 second
[chk] 2-character checksum. If checksum is disabled, no [chk].
(cr) 0x0D
Response
:
Valid response !AA[chk](cr)
Invalid response ?AA[chk](cr)
no response Syntax error, communication error or address error
! A delimiter character indicating a valid response
? A delimiter character indicating an invalid response
AA 2-character HEX module address
[chk] 2-character checksum. If checksum is disabled no [chk]
(cr) 0x0D
Examples
:
Disable host watchdog timer of module 01
command ~013000(cr)
response !01(cr)
Host watchdog timer of module 02 is enabled and time-out time = 0.1 x 10 = 1 second.
If you use the %AANNTTCCFF command to change module configuration, the new configuration code is
stored into EEPROM immediately.
The configuration code includes the module address, module type, baud rate code, checksum enable/disable
code, calibration code, power-on value and safe value.
The EEPROM data of a CB-7080 can be read an infinite number of times, and can be written about 100,000
times maximum. Therefore, you should not frequently change the configuration code for testing.
The $AA2 command is used to read EEPROM data only. You can send this command to CB-7080 module
without limit.
: Read the Hi-Hi-alarm limit of counter 0 (for alarm-mode 1). Refer to Counter alarm mode
selection for more information.
Syntax
: @AARA[chk](cr)
@ A delimiter character
AA 2-character HEX module address, from 00 to FF
RA
[chk] 2-character checksum. If checksum is disabled, no [chk]
(cr) 0x0D
Response
:
Valid response !AA(data)[chk](cr)
invalid response ?AA[chk](cr)
no response: Syntax error, communication error or address error
! A delimiter character indicating a valid response
? A delimiter character indicating an invalid response
AA 2-character HEX module address
(data) 8-character HEX value.
[chk] 2-character checksum. If checksum is disabled, no [chk]
(cr) 0x0D
Examples
:
The Hi-Hi-alarm limit of counter 0 is FFFF0000h:
command: @01RA(cr)
response: !01FFFF0000(cr)
The Hi-Hi-alarm limit of counter 0 is 0000FFFFh;
command: @02RA(cr)
response: !020000FFFF(cr)
2-53
3
Operating principle and application notes
INIT*_pin operation principle
All CB-7000 modules contain an EEPROM to store configuration information. To determine the status of the
CB-7080 modules, connect the INIT*_pin to the GND_pin and apply power to the module. The CB-7080
modules will go to the factory default setting without changing the EEPROM data. The factory default setting
is as follows:
Address = 00
baud rate = 9600
checksum = DISABLED
data format = 1 start + 8 data bits + 1 stop bit
To auto-configure the CB-7080/7080D module according to the EEPROM data:
Disconnect the INIT*_pin and GND_pin.
To find the EEPROM configuration data easily in the default setting:
1. Power-down the module, and connect the INIT*_pin to GND_pin.
2. Power-up the module.
3. Send command string $002[0x0D] to the module.
The module returns EPROM data.
4. Record the EEPROM data.
5. Power-down the module, and disconnect the INIT*_pin from the GND pin.
6. Power-up the module.
D/O operation principles
Refer to Digital output application notes on page 1-7 for more information.
The D/O outputs of CB-7080 and CB-7080D modules are OFF on the first power-up.
The D/O outputs are changed to the desired state if the “@AADO0D” command is received. Then, all
D/Os will stay in the same states until the next “@AADO0D” command.
If the host watchdog is active, D/Os do not change, and the module status is set to 04. If the host
computer sends “@AADO0D” to those modules now, those modules will ignore this command and
return “!” as warning information. The host must use “~AA1” command to clear the module status to 0,
then the CB-7080 and CB-7080D module will accept the “@AADO0D” again.
If a D/O output is configured as an alarm output, the module controls the ON/OFF state automatically.
The “@AADO0D” command is ignored in this condition.
3-1
EC Declaration of Conformity
We, Measurement Computing Corporation, declare under sole responsibility that the product:
CB-7080 2 channel 32-bit counter/frequency input module
CB-7080D 2 channel 32-bit counter/frequency input module with LED display
Part Numbers
to which this declaration relates, meets the essential requirements, is in conformity with, and CE marking has
been applied according to the relevant EC Directives listed below using the relevant section of the following
EC standards and other normative documents:
EU EMC Directive 89/336/EEC: Essential requirements relating to electromagnetic compatibility.
EU 55022 Class B (1995): Radiated and conducted emission requirements for information technology
equipment.
EN 50082-1 (1997): EC generic immunity requirements.
EN 61000-4-2 (1995): Electrostatic discharge immunity.
EN 61000-4-3 (1997) ENV 50204 (1996): RF Immunity.
EN 61000-4-4 (1995): Electric fast transient burst immunity.
Description
We hereby declare that the equipment specified conforms to the above Directives and Standards.
Carl Haapaoja, Vice-President of Design Verification
Measurement Computing Corporation
16 Commerce Boulevard,
Middleboro, Massachusetts 02346
(508) 946-5100
Fax: (508) 946-9500
E-mail:
info@mcc.com
www.mcc.com
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