Vaisala DPT145 Guía de usuario descargar pdf (Pagina 60)

User's Guide _______________________________________________________________________

60 ___________________________________________________________________ M211371EN-D

APPENDIX A

MODBUS REFERENCE

This appendix describes the Modbus protocol implementation of the

DPT145 transmitters.

Default Communication Settings

Table 19 below shows the default communication settings when Modbus

is enabled at the factory.

Table 19 Default Communication Settings

Setting

Default Value

Configuration Command

for Changing the Value)*

Bit rate

19200

SERI

Number of data bits

Parity

Number of stop bits

Device address

240

ADDR

Response delay

SDELAY

Communication mode

MODBUS

SMODE

* See Table 5 on page 33.

NOTE

You can also change device address with Modbus itself (register 1537).

Supported Modbus Functions

Table 20 Supported Function Codes

Function

Code

(decimal)

Function Code

(hexadecimal)

Function Name

(as defined by the

specification)

Notes

Read Holding Registers

See Table 21 on page 61 for

available registers.

Write Multiple Registers

See Table 21 on page 61 for writable

registers.

43 14

2B 0E

Read Device Identification

See Table 22 on page 62 for

available device identification objects.

NOTE

After power-up, wait for five seconds before sending Modbus requests.

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