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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.
4. Set Parity, Stop Bits, and Baud Rate as appropriate for your network.
5. Set Floating-Point Byte Order to match the byte order used by your Modbus host.
Code Byte order
0 1–2 3–4
1 3–4 1–2
2 2–1 4–3
Integrate the meter with the control system
108 Micro Motion
®
Model 1700 Transmitters with Analog Outputs