IEC 62056-21:2002 Serial
IEC62056-21:2002 Serial communication protocol
The protocol implements serial communication with devices according to international standard IEC62056-21, protocol mode C, or protocol mode D (passive readout).
Communication line categories: Serial, SerialOverUDP Device Redundant, RFC2217 Client, MOXA IP Serial Library, TCP/IP-TCP, and MODEM.
To set the transmission parameters, use even parity, 7 data bits, and 1 stop bit in all line categories!
A transfer rate according to the setting of a specific device or modem (in protocol mode D, the transfer rate is 2400 baud according to the standard).
The implicit parameters comply with the MODEM line (tab "Modem - parameters"), and the specific parameters can be configured by station protocol parameters for modem initialization.
Configuration dialog box, tab Protocol parameters - select the protocol "IEC62056-21:2002 Serial".
Table 1
Parameter | Meaning | Unit | Default value |
|---|---|---|---|
Immediate Disconnect | The parameter is implemented only for TCP/IP-TCP line category. The parameter activates the disconnection of the TCP connection after each reading cycle, or after time synchronization. The parameter was implemented to enable communication between other devices and electricity meters. | YES/NO | NO |
Area Code | The common call prefix for phone modem connection (only lines of the MODEM category). |
|
|
Software 7E1 | The YES value activates SW emulation of transfer parameters of 7 data bits, even parity, when the transfer parameters of 8 data bits, no parity, are set (i.e., emulation 7E1 when 8N1 is set). | YES/NO | NO |
Communication protocol "IEC62056-21:2002 Serial".
The station address (device) is optional. If the parameter is empty, the device must answer. If there are more devices on one line (e.g., RS485 bus), the device address must be set. The device address consists of a maximum of 32 characters that are formed from figures (0 - 9), capital letters (A - Z), small letters (a - z), or spaces ( ). The zeroes in front of a valid figure are ignored (i.e., address 10203 = 010203 = 000010203).
Configuration dialog box - tab Protocol parameters.
These parameters influence some optional protocol parameters. The following station protocol parameters can be set:
Table 2
Parameter | Meaning | Unit | Default value |
|---|---|---|---|
Modem Telephone Number | The phone number for connection via modem with this station (only lines of the MODEM category). |
|
|
| |||
Dial Timeout | The maximum waiting time on connection via modem (only lines of the MODEM category). | sec | 60 |
Dial Retry Count | The maximum number of attempts to connect via modem (only lines of the MODEM category). | 1..20 | 1 |
Dial Retry Timeout | Delay before attempting to dial after an unsuccessful connection attempt (only lines of the MODEM category). | sec | 30 |
Wait First Timeout | The time delay between sending the request and reading the answer. | ms | 200 |
Wait Timeout | The time delay between reading the answer till it is completed. See the note for the Wait First Timeout parameter. | ms | 200 |
Max Wait Retry | A retry count for reading the response until its completion. | 1 .. 100 | 20 |
Retry Timeout | The delay between the request retries, if a communication error occured. | ms | 1000 ms |
Retry Count | A number of retries in case of a communication error. | 1 .. 20 | 3 |
Disconnect Timeout | Timeout for waiting for an answer to the modem hangup operation (only lines of the MODEM category). | sec | 15 |
Passive Mode | Activation of a passive mode, which corresponds to IEC62056-21, protocol mode D (no requests are sent, data arrives spontaneously) | YES/NO | NO |
| |||
Baudrate Changeover (Z) | Value of 'Z' parameter - Baud rate identification (for baud rate changeover) of Acknowledgement/option select message request of protocol's C mode. AUTO option finds out automatically the value 'Z' from the acknowledging answer and uses it. | 300 Baud | 2400 Baud |
Data Readout | The parameter enables the reading of the current values ("data readout"). | YES/NO | YES |
Manuf. Spec. Table Readout Nr.1 (Y) | The parameter enables reading of the "manufacturer-specific table" values, 1st block. | - | - |
Manuf. Spec. Table Readout Nr.2 (Y) | The parameter enables reading of the "manufacturer-specific table" values, 2nd block. | - | - |
Manuf. Spec. Table Readout Nr.3 (Y) | The parameter enables reading of the "manufacturer-specific table" values, 3rd block. | - | - |
Load Profile | The parameter enables the reading of the historical data from the profile. | YES/NO | YES |
Profile | Profile name - OBIS code of the load profile used during the reading of historical data from the profile. |
| P.01 |
Profile Time Mask | Date and time masks used for reading historical data from the profile. Meaning of the "z" flag - see the description of the Session Recognition Flag parameter. |
| zyymmddhhmi |
Profile History Depth | Time depth of historical profile readings. | hour | 24 |
Time Round | Time rounding of data from a profile. | min | 15 |
Profile Read Step | The time range of data that is queried from the profile in one request. It is entered as a multiple of the "Time Round" parameter. | x Time Round | 2 |
Profile Read Level | Access level used to read historical data from the profile. | 0-9 | 5 |
Profile Read Mode | Method of reading from the profile:
BLOCK READ divides the data into several blocks with a size of Profile Read Block Length rows. Block reading makes sense on lines with higher error rates. | - | VDEW read command (R5) |
Profile Read Block Length | Block size (number of rows) if BLOCK READ from the profile is used - if Profile Read Mode is VDEW block read command (R6) or P1 + VDEW block read command (R6) | row | 4 |
Profile Read Formatted Execution | This parameter enables specifying a special sequence that may be required by some electrometers. So far the only known sequence is F101() | - |
|
No Answer for Load Profile | If the meter does not respond when reading data from the profile, the next time interval is read (YES) or the reading is interrupted and the reading of the profile for the problematic time interval is repeated during the next data reading from the station (NO). | YES/NO | NO |
Password - level 1 | The password necessary for changing the configuration of the device (level 1) used to set the date and time. |
| "00000000" |
Session Recognition Flag | A flag that indicates the type of date/time used by the device. Electrometers LZQJ, manufactured by EMH Elektrizitätszähler, indicate the type of date/time by this flag (0=Normal Time, 1=Summer Time, 2=UTC Time). | Normal Time | Normal time |
Time Register | Register used to set the time. |
| 0.9.1 |
Time Mask | Mask used to set the time. |
| zhhmiss |
Date Register | Register used to set the date. |
| 0.9.2 |
Date Mask | Mask used to set the date. |
| zddmmyy |
Time Date Mode | Special settings used when setting the date and time. These may be required by some electricity meters.
| Normal | Normal |
| |||
AT Command 1 | A special initial string of modem 1 (only for MODEM lines). |
| AT&FE0V1Q0B0X3L0M0 |
AT Command 2 | A special initial string of modem 2 (only for MODEM lines). Explanation of recommended settings: S37=5 1200bps DTE-DTE speed - limits the speed for modems. Many devices use modems with limited transfer speeds and this setting can speed-up the connection establishment process. Higher transfer speeds must be negotiated individually. &D2 DTR drop to hangup - for matching with the parameter of modem line (line configuration, tab "Modem - parameters", check the option "Use DTR for Hangup"). S0=0 Disable auto-answer. Auto-answer will not be used. S30=2 20 sec inactivity timeout - automatic hangup after the idle timeout expired. Necessary for assuring connection termination after the communication with the last device is over. |
| ATS37=5&D2S0=0S7=60S30=2 |
Full Debug | Full tracing of communication, loaded values of I/O tags, and other debug information are shown. | YES/NO | NO |
Ignore Number of Periods | The parameter is used to ignore the "Number of Periods" value that a particular electricity meter (Schrack LZQJ) sent in the data reading for the Demand Register (class_id = 5). He sent this between the OBIS code and the value itself, which led to an unsuccessful attempt by the D2000 KOM process to interpret the value as an optional timestamp and subsequently to discard the entire data line read. Example of such a data line: | YES/NO | NO |
Unicontrols Devices | It activates data processing according to the software implementation of the protocol from Unicontrols. | YES/NO | NO |
Unicontrols Read Index | Activates reading of profile index (map of records stored in memory) within the reading of historical data from profile (Unicontrols device only). The retrieved index is not processed further and serves only as debugging information for Unicontrols. | YES/NO | NO |
Ignore BCC Error | Ignore packet checksum. The packet will be processed even if the checksum does not match. | YES/NO | NO |
Possible types of I/O tag values: Ai, Ci, Di, TxtI, TiA, TiR.
I/O tag address corresponds to standard IEC 62056-61:2002 Object Identification System (OBIS) in terms of "Annex A - Code presentation".
The I/O tag with an address starting with %IGNORE will be ignored.
Abbreviated format of the address is supported: C.D[.E][*F] as well as full format A.B.C.D[.E][*F]
(from 31.5.2021 also format containing colon and hyphen separators instead of a full stop, e.g. A-B:C.D.E)
in which:
A - Value group A (number in range 0..15). The number defines the media (energy type) to which the metering is related. Non-media related information is handled as abstract data.
0 - Abstract objects
1 - Electricity related objects
4 - Heat cost allocator related objects
5 - Cooling related objects
6 - Heat related objects
7 - Gas related objects
8 - Cold water related objects
9 - Hot water related objects
All other - reserved
B - Value group B (number in range 0..255). The number defines the channel number (for devices with multiple inputs, data concentrators, etc).
0 - No channel specified
1…64 - Channel 1-64
65…127 - Utility specific codes
128…199 - Manufacturer specific codes
200…255 - Reserved
C - Value group C (number in range 0..255 or characters 'C', 'F', 'L' or 'P'). The number defines the abstract or physical data items related to the information source concerned, for example, current, voltage, power, volume, temperature and for range 0…89 it depends on value group A:
0…89 -Context-specific identifiers (depending on Value group A). For electricity-related objects (A = 1):
0 - General purpose objects
1 - Sum(Li) Active power+ (QI+QIV)
2 - Sum(Li) Active power- (QII+QIII)
3 - Sum(Li) Reactive power+ (QI+QII)
4 - Sum(Li) Reactive power– (QIII+QIV)
5 - Sum(Li) Reactive power QI
6 - Sum(Li) Reactive power QII
7 - Sum(Li) Reactive power QIII
8 - Sum(Li) Reactive power QIV
9 - Sum(Li) Apparent power+ (QI+QIV)
10 - Sum(Li) Apparent power– (QII+QIII)
11 - Current : any phase
12 - Voltage : any phase
13 - Sum(Li) Power factor-
14 - Supply frequency
15 - Sum(Li) Active power (abs(QI+QIV)+abs(QII+QIII))
16 - Sum(Li) Active power (abs(QI+QIV)-abs(QII+QIII))
17 - Sum(Li) Active power QI
18 - Sum(Li) Active power QII
19 - Sum(Li) Active power QIII
20 - Sum(Li) Active power QIV
21 - L1 Active power+
22 - L1 Active power–
23 - L1 Reactive power+
24-30 L1 etc.. (see 4-10)
31 - L1 Current
32 - L1 Voltage
33 - L1 Power factor
34 - L1 Supply frequency
35-40 L1 Active power... etc. (see 15-20)
41 - L2 Active power+
42 - L2 Active power–
43 - L2 Reactive power+
44-60 - L2 etc. (see 24-40)
61 - L3 Active power+
62 - L3 Active power–
63 - L3 Reactive power+
64-80 - L3 etc. (see 24-40)
81 - Angles
82 - Unitless quantity (pulses or pieces)
83 - Transformer and line loss quantities
84 - Sum(Li) power factor–
85 - L1 Power factor–
86 - L2 Power factor–
87 - L3 Power factor–
88 - Sum(Li) Ampere-squared hours (QI+QII+QIII+QIV)
89 - Sum(Li) Volt-squared hours (QI+QII+QIII+QIV)
91 - L0 current (neutral)
92 - L0 voltage (neutral)
93 - Consortia specific identifiers
94 - Country specific identifiers
96 - Electricity-related service entries
97 - Electricity-related error messages
98 - Electricity list
99 - Electricity data profile
100…127 - Reserved
128...199, 240 - Manufacturer specific codes
All other - Reserved
93 - Consortia specific identifiers
94 - Country specific identifiers
96 - General service entries (can be entered as character 'C')
97 - General error messages (can be entered as character 'F')
98 - General list objects (can be entered as character 'L')
99 - Abstract data profiles (can be entered as character 'P')
127 - Inactive objects
128…199, 240 - Manufacturer specific codes
200…255 - Reserved
D - Value group D (number in range 0..255). The number defines types of data depending on Value group A and C, after processing by various specific algorithms. For A=1 and C<>0,93…94,95…99:
0 - Billing period average (since the last reset)
1 - Cumulative minimum 1
2 - Cumulative maximum 1
3 - Minimum 1
4 - Current average 1
5 - Last average 1
6 - Maximum 1
7 - Instantaneous value
8 - Time integral 1
9 - Time integral 2
10 - Time integral 3
11 - Cumulative minimum 2
12 - Cumulative maximum 2
13 - Minimum 2
14 - Current average 2
15 - Last average 2
16 - Maximum 2
17 - Time integral 7
18 - Time integral 8
19 - Time integral 9
20 - Time integral 10
21 - Cumulative minimum 3
22 - Cumulative maximum 3
23 - Minimum 3
24 - Current average 3
25 - Last average 3
26 - Maximum 3
27 - Current average 5
28 - Current average 6
29 - Time integral 5
30 - Time integral 6
31 - Under limit threshold
32 - Under limit occurrence counter
33 - Under limit duration
34 - Under limit magnitude
35 - Over limit threshold
36 - Over limit occurrence counter
37 - Over limit duration
38 - Over limit magnitude
39 - Missing threshold
40 - Missing occurrence counter
41 - Missing duration
42 - Missing magnitude
55 - Test average
58 - Time integral 4
128...254 - Manufacturer specific codes
All other - Reserved
E - Value group E (number in range 0..255). The number defines further processing or classification of quantities identified by value groups A, C, D. Various standard-defined classifications depending on Value groups:
Identification of tariff rates - Electricity related objects (A = 1)
Identification of harmonics - Electricity related objects (A = 1), measurement of harmonics of voltage (C = 12, 32, 52, 72, 92), current (C = 11, 31, 51, 71, 91) or active power (C = 15, 35, 55, 75), D = 7 or D = 24
Identification of phase angles - Electricity related objects (A = 1); angle measurement (C = 81; D = 7)
Identification of transformer and line loss quantities - Electricity related objects (A = 1); transformer and line loss quantities (C = 83)
Identification of UNIPEDE voltage dips - Electricity related objects (A = 1), Voltage dips measurement (C = 12, 32, 52, 72, D = 32)
F - Value group F (number in range 0..255). The number defines the storage of data, identified by value groups A…E, according to different billing periods. Where this is not relevant, this value group can be used for further classification. If it is not used, it is set to 255.
Example of addresses:
0.0.0 Meter address
0.0.1 Identity number
0.9.1 Time
0.9.2 Date
1.2.1 Cumulative P+ Tariff 1
1.2.2 Cumulative P+ Tariff 2
1.6.1 Maximum P+ Tariff 1
1.8.1 Energy P+ Tariff 1
3.6.1 Maximum Q+ Tariff 1
3.6.1*01 01.Pre-value Maximum Q+ Tariff 1
International Standard IEC 62056-21, Direct Data Local Exchange, First edition 2002-05.
International Standard IEC 62056-61, Object Identification System (OBIS), Second edition 2006-11.
Energie-Info, OBIS-Kennzahlen-System, Stand: 03. November 2006, www.vdew.net.
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Ver. 1.0 - April 24th, 2009 - document creation.
Ver. 1.1 - July 27th, 2022 - support for Mode D (parameter Passive Mode)
Related pages: