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70 Micro Motion
®
Model 2400S Transmitters for PROFIBUS-DP
Optional Configuration
To configure the IrDA port for read-only or read/write access:
• Using ProLink II, see Figure C-2.
• Using the display menus, see Figure C-15.
• Using a PROFIBUS host with the EDD, see Figure C-10.
• Using PROFIBUS bus parameters, use the Local Display block (see Table D-6), Index 35.
8.10.3 Modbus address
Note: The Modbus address is applicable only when you are connecting to the service port from a tool
that uses Modbus protocol. After initial startup, service port connections are typically used only for
troubleshooting or for specific procedures such as temperature calibration. ProLink II is typically
used for service port connections, and by default ProLink II will use the standard service port address
rather than the configured Modbus address. See Section 4.4 for more information.
The set of valid Modbus addresses depends on whether or not support for Modbus ASCII is enabled
or disabled (see Section 8.10.4). Valid Modbus addresses are as follows:
• Modbus ASCII enabled:
1–15, 32–47, 64–79, 96–110
• Modbus ASCII disabled: 0–127
To configure the Modbus address:
• Using ProLink II, see Figure C-2.
• Using the display, see Figure C-15.
Note: This functionality cannot be configured via PROFIBUS protocol.
8.10.4 Modbus ASCII support
When support for Modbus ASCII is enabled, the service port can accept connection requests that use
either Modbus ASCII or Modbus RTU. When support for Modbus ASCII is disabled, the service port
cannot accept connection requests that use Modbus ASCII. Only Modbus RTU connections are
accepted.
The primary reason to disable Modbus ASCII support is to allow a wider range of Modbus addresses
for the service port.
To enable or disable Modbus ASCII support:
• Using ProLink II, see Figure C-2.
• Using the display, see Figure C-15.
Note: This functionality cannot be configured via PROFIBUS protocol.
8.10.5 Floating-point byte order
Note: This parameter affects only Modbus communications. PROFIBUS communications are not
changed.
Four bytes are used to transmit floating-point values. For contents of bytes, see Table 8-11.