Vaisala DPT146 Uživatelská příručka stáhnout pdf (Strana 68)

User's Guide _______________________________________________________________________

66 ___________________________________________________________________ M211372EN-D

APPENDIX A

MODBUS REFERENCE

This appendix describes the Modbus protocol implementation of the

DPT146 transmitters.

Default Communication Settings

Table 20 below shows the default communication settings when Modbus

is enabled at the factory.

Table 20 Default Communication Settings

Setting

Default Value

Configuration mode 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 6 on page 36.

NOTE

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

Supported Modbus Functions

Table 21 Supported Function Codes

Function

Code

(decimal)

Function Code

(hexadecimal)

Function Name

(as defined by the specification)

Notes

Read Holding Registers

See Table 22 on page 67

for available registers.

Write Multiple Registers

See Table 22 on page 67

for writable registers.

43 14

2B 0E

Read Device Identification

See Table 23 on page 68

for available device

identification objects.

NOTE

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

1 2 ... 63 64 65 66 67 68 69 70 71

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