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6.6.3 Configure Modbus/RS-485 communications
Display OFF-LINE MAINT > OFF-LINE CONFG > COMM
ProLink II ProLink > Configuration > Device > Digital Comm Settings
ProLink III Device Tools > Configuration > Communications > RS-485 Terminals
Field Communicator Configure > Manual Setup > Inputs/Outputs > Communications > Set Up RS-485 Port
Overview
Modbus/RS-485 communications parameters control Modbus communication with the
transmitter's RS-485 terminals.
Modbus/RS-485 communications parameters include:
•
Disable Modbus ASCII
•
Protocol
• Modbus Address (Slave Address)
• Parity, Stop Bits, and Baud Rate
•
Floating-Point Byte Order
•
Additional Communications Response Delay
Restriction
To configure Floating-Point Byte Order or Additional Communications Response Delay, you must use ProLink II.
Procedure
1.
Set Disable Modbus ASCII as desired.
Support for Modbus ASCII limits the set of addresses that are available for the
transmitter's Modbus address.
Modbus ASCII support Available Modbus addresses
Disabled
1–127, excluding 111 (111 is reserved to the service port)
Enabled
1–15, 32–47, 64–79, and 96–110
2. Set Protocol to match the protocol used by your Modbus/RS-485 host.
Options Description
Modbus RTU (default)
8–bit communications
Modbus ASCII
7–bit communications
If support for Modbus ASCII is disabled, you must use Modbus RTU.
3.
Set Modbus Address to a unique value on the network.
Integrate the meter with the control system
130 Micro Motion
®
Model 2700 Transmitters with Analog Outputs