DSM-MOD
Description: The Delta Controls fully programmable, Modbus gateway allows Delta products to map registers in Modbus slave devices into standard BACnet objects, which are then accessible on a BACnet™ network via available ports. Controllers become Masters to the connected Modbus slave devices and communicate using the Modbus RTU protocol on an RS-232 or RS-485 LAN, depending on controller hardware.
Features:
- Modbus protocol provides a common language for devices to exchange data between BACnet and Modbus
- Supports Modbus capability via flash loading in the field
- Supports flash loading Modbus upgrades via hardware key
- Decimal scaling from 1/1000 to 1000 for imbedded integer to real number conversions
- Assign bits within registers directly to Binary Variables
- Display Exception Codes on a per register basis
- Assign registers with 0 based (x0000) or 1-based (Register 1) offset to match documentation
- Assign registers to multi-state variables directly with or without offset of 1 as required
Application: The Delta Modbus products come in two categories, gateway and controller. Gateway products, pre-loaded with Modbus, provide a gateway to BACnet for multiple Modbus devices communicating on the same Modbus network (5, 15, or 30 Modbus slave devices).
Controller products with Modbus capability are used where a Delta I/O controller already exists, and there is a need to add Modbus devices as part of the same mechanical system. This provides support for communication of 1 to 5 Modbus slave devices using a standard controller by flash loading Modbus using an associated hardware key. Modbus capability via flash loading in the field is used for controllers using firmware V3.30R2 or higher, to a maximum 5 Modbus units.
Ordering: Order products with Modbus pre-loaded, according to the following product numbers:
- DSM-RTR-MOD30—Router, Ethernet I/P, BACnet MS/TP, PTP Router, Gateway for 30 Modbus devices
- DSM-T0B-MOD5—Room Controller, 16 button, Temperature, Occupation & Number keys, Gateway for 5 Modbus devices
- DSM-T0B-MOD15—Room Controller, 16 button, Temperature, Occupation & Number keys, Gateway for 15 Modbus devices
- DSM-T0B-MOD-30—Room Controller, 16 button, Temperature, Occupation & Number keys, Gateway for 30 Modbus devices
Accessories: Order Modbus Flash Loader Firmware Key and Credits according to the following product numbers:
- DFF099-KEY—Flash Loader Firmware Key with 50 credits loaded
- DFF099-CDT—Flash Loader Credits, additional credits ordered in blocks of 50
Protocol
Modbus RTU
Ports
RS-485, RS-232, UDP
Baud Rates
@ 9600, 19200, 38400 bps
Packet Structure
8 data bit, no parity, 1 stop bit (8-N-1)
Modbus Functions Supported
(01) Read Coil Status (0xxxx)
(02) Read Input Status (1xxxx)
(03) Read Holding Register (4xxxx)
(04) Read Input Registers (3xxxx)
(05) Force (Write) Single Coil (0xxxx)
(06) Preset (Write) Single Register (4xxxx)
Built-in Gateway Features
Exception codes per entry
Decimal scaling (Value * .001 to 1000)
Bit extraction (Read Only)
Register Base Count offset (0 or 1)
Multistate offset (for MV translation)
Number of devices supported: up to 30 (device type dependent)
Note: For further information, review the DSM-RTR or DSM-T0B catalog sheets for respective hardware specifications.