Modbus
E216146
application layer protocol
communication protocol
industrial Ethernet protocol
industrial communication protocol
serial communication protocol
Modbus is a widely used serial communication protocol in industrial automation systems for connecting electronic devices and transmitting data between controllers and field instruments.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Modbus canonical | 5 |
| Modbus TCP | 2 |
| Modbus ASCII | 1 |
| Modbus RTU | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1938037 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Modbus Context triple: [DNP3, competesWith, Modbus]
-
A.
I2C
I2C is a widely used two-wire serial communication bus that enables simple, low-speed data exchange between microcontrollers and peripheral devices on the same circuit board.
-
B.
EtherCAT
EtherCAT is a high-performance industrial Ethernet protocol designed for real-time control in automation systems.
-
C.
Sercos III
Sercos III is a real-time industrial Ethernet communication standard widely used for high-performance motion control and automation systems.
-
D.
OPC
OPC is the acronym for the Office of Policy Coordination, a covert U.S. government organization that oversaw psychological and paramilitary operations during the early Cold War.
-
E.
OPC
OPC is Opel's high-performance division responsible for developing sportier, more powerful versions of the brand's standard production models.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Modbus Target entity description: Modbus is a widely used serial communication protocol in industrial automation systems for connecting electronic devices and transmitting data between controllers and field instruments.
-
A.
I2C
I2C is a widely used two-wire serial communication bus that enables simple, low-speed data exchange between microcontrollers and peripheral devices on the same circuit board.
-
B.
EtherCAT
EtherCAT is a high-performance industrial Ethernet protocol designed for real-time control in automation systems.
-
C.
Sercos III
Sercos III is a real-time industrial Ethernet communication standard widely used for high-performance motion control and automation systems.
-
D.
OPC
OPC is the acronym for the Office of Policy Coordination, a covert U.S. government organization that oversaw psychological and paramilitary operations during the early Cold War.
-
E.
OPC
OPC is Opel's high-performance division responsible for developing sportier, more powerful versions of the brand's standard production models.
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
application layer protocol
ⓘ
communication protocol ⓘ industrial Ethernet protocol ⓘ industrial communication protocol ⓘ serial communication protocol ⓘ serial communication protocol ⓘ serial communication protocol ⓘ |
| abbreviationOf | Modicon bus ⓘ |
| definesOSIModelLayer | application layer ⓘ |
| developedBy |
Schneider Electric
ⓘ
surface form:
Modicon
|
| doesNotDefineOSIModelLayer |
data link layer
ⓘ
physical layer ⓘ |
| hasVariant |
Modbus
self-linksurface differs
ⓘ
surface form:
Modbus ASCII
Modbus Plus ⓘ Modbus self-linksurface differs ⓘ
surface form:
Modbus RTU
Modbus self-linksurface differs ⓘ
surface form:
Modbus TCP
|
| introducedInYear | 1979 ⓘ |
| isOpenSpecification | true ⓘ |
| isWidelyImplementedBy |
DCS vendors
ⓘ
PLC manufacturers ⓘ instrumentation manufacturers ⓘ |
| originallyDevelopedFor | programmable logic controllers ⓘ |
| runsOnTransportProtocol |
Transmission Control Protocol
ⓘ
surface form:
TCP
|
| supportsDataModel |
coils
ⓘ
discrete inputs ⓘ holding registers ⓘ input registers ⓘ |
| supportsFunction |
read coils
ⓘ
read discrete inputs ⓘ read holding registers ⓘ read input registers ⓘ write multiple coils ⓘ write multiple registers ⓘ write single coil ⓘ write single register ⓘ |
| supportsNetworkType | Ethernet ⓘ |
| supportsPhysicalLayer |
EIA-232
ⓘ
surface form:
RS-232
RS-422 ⓘ RS-485 ⓘ |
| supportsTopology |
client-server
ⓘ
master-slave ⓘ |
| typicallyUsesBaudRateRange | 1200–115200 bit/s ⓘ |
| usedInDomain |
SCADA systems
ⓘ
building automation ⓘ industrial automation ⓘ process control ⓘ |
| usesAddressing |
device addresses
ⓘ
register addresses ⓘ |
| usesDefaultPort | 502 ⓘ |
| usesEncoding |
ASCII
ⓘ
binary ⓘ |
| usesErrorChecking |
CRC
ⓘ
LRC ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Modbus Description of subject: Modbus is a widely used serial communication protocol in industrial automation systems for connecting electronic devices and transmitting data between controllers and field instruments.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Modbus RTU
this entity surface form:
Modbus ASCII
this entity surface form:
Modbus TCP
this entity surface form:
Modbus TCP