Comtrol Modbus TCP User Guide - Manual (Page 21)

DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I Chapter 2. Programming Interface - 21
Ethernet Device Raw/ASCII Interface
2.2.3. Ethernet Device Raw/ASCII Interface
2.2.4. Raw/ASCII Transfer Modes
The DeviceMaster UP supports two different raw/ASCII message transfer modes. The default Data-Stream
mode is the traditional transfer mode that asynchronously transmits messages and returns received data/
responses. The Command/Response mode provides a synchronous transfer mode for sending and returning
responses.
2.2.4.1. Data-Stream Mode
The Data-Stream transfer mode is the default transfer mode that asynchronously transmits messages from
all Modbus and Application interfaces and returns received data/responses to all Modbus and Application
interfaces. This mode is typically used in installations that utilize only one controller and for receive-only
devices such as barcode scanners, RFID readers, weigh scales, and position encoders.
Socket Port Raw
Data Addressing
Socket Port 1 Socket Port 2 Socket Port 3 Socket Port 4 Access Rule
Unit ID 254 (FE hex) 254 (FE hex) 254 (FE hex) 254 (FE hex) N/A
Receive Data
Address 1000 (Base 0)
1001 (Base 1)
2000 (Base 0)
2001 (Base 1)
3000 (Base 0)
3001 (Base 1)
4000 (Base 0)
4001 (Base 1)
Read Only
Receive Data
Sequence Number
Address
1256 (Base 0
1257 (Base 1)
2256 (Base 0
2257 (Base 1)
3256 (Base 0
3257 (Base 1)
4256 (Base 0
4257 (Base 1)
Read/Write
Transmit Data
Address 1300 (Base 0)
1301 (Base 1)
2300 (Base 0)
2301 (Base 1)
3300 (Base 0)
3301 (Base 1)
4300 (Base 0)
4301 (Base 1)
Read/Write
Transmit Data
Sequence Number
Address
1556 (Base 0)
1557 (Base 1)
2556 (Base 0)
2557 (Base 1)
3556 (Base 0)
3557 (Base 1)
4556 (Base 0)
4557 (Base 1)
Read/Write