DH-485 to Modbus Master/Slave Communication Module
5102-DH485-MCM3
Product Description
The ProLinx family DH-485 to Modbus Master/Slave communications module (5102-DH485-MCM3) creates a powerful connection between devices on a Modbus network and a DH-485 master or slave device. The module is a stand-alone DIN rail-mounted protocol gateway that provides one DH-485 Master or Slave configurable serial port and three Modbus Master or Slave configurable serial ports.
The ProLinx DH485 protocol driver supports the Master and the Slave modes of the protocol, providing powerful data transfer capability with Rockwell Automation PLCs and HMIs. User configurable data mapping make the interface an easy to use and powerful data transfer tool.
The Modbus (MCM) protocol driver supports Master and Slave implementations of the protocol. All Modbus serial ports are individually configurable, providing a very powerful and flexible host or device interface solution.
Product Applications
The DH485-MCM modules are the ideal solution for the many applications where Modbus connectivity can be used to integrate a DH-485 device into a system.
The DH-485 gateway is a powerful module designed with both Master and Slave support, enabling easy connection to Rockwell Automation PLCs (CLX, SLC, PLC, CPLX, and similar devices). In combination with the Modbus device support, the module provides a very powerful interface to the many Modbus devices which are in use in the industrial marketplace today. Applications for the module are found in most industries, especially the Manufacturing, Oil and Gas, Electrical Power and Food Processing.
Functional Specifications
Internal Database
The ProLinx module contains an internal database that consists of areas for application data, status information, and configuration information.
The internal database is shared between all ports on the module and is used as a conduit to pass information from a device on one network to one or more devices on another network.
Application Data Area
The data area is used to store and retrieve data by the protocol drivers and for data exchange between protocols. The database is used as a source for write commands to remote devices and holds data collected from the remote devices. Commands defined in the configuration file (stored in the configuration data area) control how the data is to be handled in the database.
Status Data Area
This area is used to store error codes, counters, and port status information for each port.
Configuration Data Area
This area contains module configuration information such as port configuration, network information, and command configuration. This configuration file is downloaded to, or uploaded from, this area.
DH485 Master/Slave Serial Port Specifications
The DH485 protocol in its native form is a peer to peer token passing network. The ProLinx DH485 driver accesses the network functioning either as a Master or as a Slave.
In the Master mode, the ProLinx DH485 driver will actively gather data from other devices on the network, controlling the read/write data transfer between the gateway and other DH485 devices, such as SLC processors. When configured in this mode, data transfer can be initiated and executed with the other devices without any ladder logic being required in the Rockwell Automation slave hardware.
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General Protocol Information
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Type
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Specifications
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DH485 Modes
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Full-Duplex and Half-Duplex
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Error Checking
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BCC and CRC
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User configurable Communication parameters
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Local Station ID: 0 to 31
Port 0 Baud Rate: 110 to 38.4K baud
Port 1,2,3 Baud Rate: 110 to 115K baud
Stop Bits : 1 or 2
Data Size: 7 or 8 bits
Parity: None, Even, Odd
RTS Timing delays: 0 to 65535 ms
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DH485 Slave Mode
In the Slave mode, the module accepts commands from one or more Masters to read/write data stored in the module's internal data memory. In this mode, the ProLinx unit is answering DH485 commands and has the appearance of an SLC processor to the network.
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DH485 Functioning as a Slave
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Type
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Specifications
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Data File
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Data Table File Start - Fixed at N10
Data Table File Size - 100 or 1000 words
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Supported Commands
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0x01 P3_UNPROTECTED_READ_CMD
0x06 P3_DIAGNOSTIC_CMD
0x00 P3_DIAG_LOOP_FUNC
0x01 P3_DIAG_READ_FUNC
0x03 P3_DIAG_STATUS_FUNC
0x07 P3_DIAG_RESET_FUNC
0x09 P3_DIAG_READ_LINK_FUNC
0x0A P3_DIAG_SET_LINK_FUNC
0x08 P3_UNPROTECTED_WRITE_CMD
0x0F P3_TYPED_RW_CMD
0xA1 P3_TYPED_READ_2ADD_FUNC
0xA2 P3_TYPED_READ_3ADD_FUNC
0xA9 P3_TYPED_WRITE_2ADD_FUNC
0xAA P3_TYPED_WRITE_3ADD_FUNC
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DH485 Master Mode
In the Master mode, the ProLinx DH485 driver will actively gather data from other devices on the network, controlling the read/write data transfer between the gateway and other DH485 devices, such as SLC processors. When configured in this mode, data transfer can be initiated and executed with the other devices without any ladder logic being required in the Rockwell Automation slave hardware.
These commands are user-configured in the module via the master command list received from the configuration file. Command status is available in the status data block for each individual command in the command list status data area. The location of this status block in a module's internal database is user-defined.
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DH485 Functioning as a Master
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Type
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Specifications
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Configurable Parameters per Master port
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Min Command Delay
Command Error DB Offset
Response Timeout
Token Hold Factor
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Command List
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Up to 100 command per master port, each fully configurable for function, slave address, register to/from addressing and word/bit count
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Status Data
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Error codes available on an individual command basis. In addition, a slave status list is maintained per active master port.
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Polling of command list
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User configurable polling of commands, including disabled, continuous and on change of data (write only)
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Modbus Protocol Specifications
The Modbus driver provides access to an internal database of 4000 registers (words), with extensive support provided for both the Master and the Slave implementations of the protocol. The serial port(s) on the gateway can be individually configured to support the Modbus protocol (Master or Slave, RTU or ASCII, Baud Rate, etc).
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General Parameters - Modbus Protocol
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Type
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Specifications
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Communication parameters
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Baud Rate: 110 to 115K baud
Stop Bits: 1 or 2
Data Size: 7 or 8 bits
Parity: None, Even, Odd
RTS Timing delays: 0 to 65535 ms
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Error Checking
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RTU mode (binary) with CRC-16
ASCII mode with LRC error checking
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Floating Point
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Floating point data movement supported, including configurable support for Enron implementation
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Function Codes
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1 : Read Output Status
2 : Read Input Status
3 : Read Multiple Data Registers
4 : Read Input Registers
5 : Write Single Bit
6 : Write Single Data Register
15 : Write Multiple Bits
16 : Write Multiple Data Register
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Modbus Master
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Type
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Specifications
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Command List
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Up to 100 command per master port, each fully configurable for function, slave address, register to/from addressing and word/bit count
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Status Data
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Error codes are provided on an individual command basis, as well as a slave status list is maintained per active Modbus Master port.
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Polling of command list
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Configurable polling of command list, including continuous and on change of data, and dynamically user or automatic enabled.
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Modbus Slave
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Type
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Specifications
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Node address
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1 to 247 - software selectable
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Status Data
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Error codes, counters and port status available per configured slave port. Status data is all pre-mapped in the module
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Hardware Specifications
| Power Supply |
24 VDC nominal |
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18-32 VDC allowed |
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Positive, Negative, GND Terminals |
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2.5 mm screwdriver blade |
Current Load
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500 mA max@ 32 VDC max |
| Operating Temperature |
-20 to 50 Deg C |
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-4 to 122 Deg F |
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Storage Temperature |
-40 to 85 Deg C |
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-40 to 185 Deg F |
| Relative Humidity |
5-95% (w/o condensation) |
| Dimensions |
Standard
5.20H x 2.07W x 4.52D inches
13.2cmH x 5.25cmW x 11.48cmD
Extended
5.20H x 2.73W x 4.52D inches
13.2cmH x 6.934cmW x 11.48cmD |
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LED Indicators |
Power and Module Status |
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Application Status |
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Serial Port Activity LED |
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Serial Activity and Error LED Status |
| Configuration Serial Port |
Mini-DIN |
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RS-232 only |
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No hardware handshaking |
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Ethernet Port |
10Base-T Connector |
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Link and Activity LED indicators |
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Electrical Isolation 1500 V rms at 50 Hz to 60 Hz for 60 s, applied as specified in section 5.3.2 of IEC 60950: 1991 |
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Ethernet Broadcast Storm Resiliency = less than or equal to 5000 [ARP] frames-per-second and less than or equal to 5 minutes duration |
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Application Serial Ports |
Mini-DIN |
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RS-232/422/485 |
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RS232 handshaking configurable |
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RS422/485 screw termination included |
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Port Isolation |
2500V Opto-Isolators |
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500V Power Supply Isolation |
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Shipped with each unit |
Mini-DIN to DB-9M cables per serial port |
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4 ft RS-232 configuration cable |
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2.5mm screwdriver |
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CD (docs and Configuration utility) |
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RS-422/485 DB9 to Screw Terminal |
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Adaptor (1 or 4, depending on ports) |
Click here for dimensions diagram Certifications
The ProLinx gateway module has the following certifications:
CE
ATEX Cat 3 Zone 2
cULus Haz Loc Class 1, Div 2
Ordering Information
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5102-DH485-MCM3
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DH-485 to Modbus Master/Slave 3 port
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To place an order, please contact your local ProSoft Technology, Inc. distributor. For a list of ProSoft distributors near you, click here.
Distributors:
Place your order by email to orders@prosoft-technology.com:, fax to +1 661-716-5101.
Sales and Support:
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