Vaisala HUMICAP MMT162 Guia do Utilizador descarregar pdf (Página 72)

User's Guide _______________________________________________________________________

70 ___________________________________________________________________ M210934EN-D

APPENDIX A

MODBUS REFERENCE

This appendix describes the Modbus protocol implementation of the

MMT162 transmitter.

Default Communication Settings

Table 12 below shows the default communication settings when Modbus

is enabled at the factory. For information on how to configure the

communication settings using serial line commands, see Table 10 on

page 45.

Table 12 Default Communication Settings

Setting

Default Value

Bit rate

19200

Number of data bits

Parity

Number of stop bits

Device address

240

Response delay

Communication mode

MODBUS

NOTE

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

Supported Modbus Functions

Table 13 Supported Function Codes

Function

Code

(decimal)

Function Code

(hexadecimal)

Function Name

(as defined by the specification)

Notes

Read Holding Registers

See Table 14 on page 71

for available registers.

Write Multiple Registers

See Table 14 on page 71

for available registers.

43 14

2B 0E

Read Device Identification

See Table 15 on page 72

for available device

identification objects.

NOTE

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

1 2 ... 67 68 69 70 71 72 73 74 75

Comentários a estes Manuais

Sem comentários

Vaisala HUMICAP MMT162 Guia do Utilizador Página 72

Comentários a estes Manuais

Manuais e produtos relacionados com Medição, teste e controlo Vaisala HUMICAP MMT162