EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
32
8.1 SDM Output
SDM (Synchronous Device for Measurement) is a Campbell Scientific
communication protocol that allows synchronized measurement and rapid
communication between a Campbell Scientific datalogger and multiple devices
including the EC155. Although nearly all of the Campbell Scientific
dataloggers support SDM, only the CR6, CR1000X, CR1000, CR3000, and
CR5000 dataloggers support the EC155.
To use SDM data output, connect an SDM cable from the EC100 (see Section
(p. 20)
) to a CR6, CR1000X, CR1000, CR3000, or
CR5000 datalogger. On CR1000 dataloggers, the SDM port is made of
terminals C1 – C3. The default SDM port for CR6 and CR1000X dataloggers
is made of terminals C1 – C3, though it can be changed with the
SDMBeginPort()
instruction. On CR3000 and CR5000 dataloggers, the SDM
protocol uses SDM-dedicated ports SDM-C1, SDM-C2, and SDM-C3.
Each SDM device on the SDM bus must have a unique address. The EC155
has a factory default SDM address of 1, but may be changed to any integer
value between 0 and 14 (see Section
(p. 25)
).
The sample rate for SDM output is determined by the inverse of the datalogger
scan interval, as set by the user in the datalogger program. Data are output from
the EC100 when a request is received from the logger, i.e. a
prompted
output
mode. The number of data values sent from the EC100 to the datalogger is also
set by the user in the datalogger program. CRBasic, the programming language
used by Campbell Scientific dataloggers, uses the
EC100()
instruction to get
data from an EC155. This instruction is explained in detail under Section
Datalogger Programming with CRBasic
(p. 50)
, of this manual.
8.2 USB or RS-485 Output
In contrast to the SDM output mode, which is prompted by a datalogger, data
can also be output from the EC100 via USB or RS485 in an unprompted mode.
In this case the EC100 sends out data without initiation from the receiving
device, at a rate determined by the EC100. Only one unprompted output type
(i.e., USB, RS-485) may be selected at a given time. RS-485 output is
recommended over SDM if cable lengths exceed 100 meters. If a Campbell
Scientific datalogger is not being used to collect the data from the EC155,
either unprompted mode is recommended.
To use USB or RS-485 output, connect a USB or RS-485 cable from the
EC100 to the receiving device (see Section
(p. 20)
),
and configure the settings (see Section
(p. 24)
).
The
Unprompted Output
parameter must be set to USB or RS-485.
If RS-485 is selected, the
RS-485 Baud Rate
must be set.
The
Unprompted Output Rate
must be set to the desired output rate.
All output data will be in ASCII format, with each data element separated by a
comma. To view the data in terminal mode, in
Device Configuration Utility
choose
Unknown
as the device type and enter
Connect
. Each record will
terminate with a carriage return and line feed. TABLE
Содержание EC155
Страница 78: ...E 1 Appendix E Safety Data Sheets SDS E 1 Molecular Sieve Type 13X ...
Страница 79: ...Appendix E Safety Data Sheets SDS E 2 ...
Страница 80: ...Appendix E Safety Data Sheets SDS E 3 ...
Страница 81: ...Appendix E Safety Data Sheets SDS E 4 ...
Страница 82: ...Appendix E Safety Data Sheets SDS E 5 E 2 Magnesium Perchlorate ...
Страница 83: ...Appendix E Safety Data Sheets SDS E 6 ...
Страница 84: ...Appendix E Safety Data Sheets SDS E 7 ...
Страница 85: ...Appendix E Safety Data Sheets SDS E 8 ...
Страница 86: ...Appendix E Safety Data Sheets SDS E 9 ...
Страница 87: ...Appendix E Safety Data Sheets SDS E 10 ...
Страница 88: ...Appendix E Safety Data Sheets SDS E 11 ...
Страница 89: ...Appendix E Safety Data Sheets SDS E 12 E 3 Decarbite ...
Страница 90: ...Appendix E Safety Data Sheets SDS E 13 ...
Страница 91: ...Appendix E Safety Data Sheets SDS E 14 ...
Страница 92: ...Appendix E Safety Data Sheets SDS E 15 ...
Страница 93: ...F 1 Appendix F EC155 Packing Information ...
