Taking Modbus into Use. Vaisala HUMICAP HMT330 SERIES, HMT330

User's Guide _______________________________________________________________________

Taking Modbus into Use

To take the Modbus protocol into use on the HMT330, you must perform some configuration tasks using the built-in display and keypad (optional) or a PC connected to the serial line. For example, you can connect to the service port using the USB service cable (Vaisala order code: 219685).

The transmitter must be powered from a suitable power supply during configuration.

Instructions for performing the configuration are provided in the following sections:

- Enabling Serial Modbus on page 143

- Enabling Ethernet Modbus on page 144

After configuring the transmitter, perform the transmitter installation and

wiring according to the instructions in Chapter 3, Installation, on page

27.

The configuration instructions assume you are familiar with the use of the transmitter. Additional details on the display/keypad, service port use, and serial commands are available in other sections of this manual:

- The use of the display/keypad option is described in section

Display/Keypad (Optional) on page 67.

- If this is the first time you are using the USB service cable, you can

find detailed instructions in section Service Port Connection on page

81. You must install the required driver before using the service cable.

- Configuration of the LAN and WLAN interfaces is decribed in section

LAN Communication on page 82.

- The serial commands available through the service port are described

beginning from section List of Serial Commands on page 93.

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