Abus-technologies Field Logger Data Acquisition/Recorder Manual de usuario descargar pdf (Pagina 13)

ABUS TECHNOLOGIES INC.

Field

Logger

take a look at it after applying a new configuration to the Field Logger. Click on the Apply button to send

the new configuration. The OK button will also transmit the new configuration to the Field Logger,

closing the window. The Cancel button simply closes the window, discarding any changes.

7.5 Serial Communication

The Field Logger communicates with the Configurator or the application software by its RS485

serial interface, using the Modbus protocol. The computer is the master and the Field Logger is the

slave. The communication is always started at the host (master), which transmits a command to the

destination address. The addressed slave (a Field Logger) recognizes the request and answers back to

the host. The Field Logger also responds to broadcast type commands.

OBS.: It is recommended to use a 326AWG shielded cable for serial communication.

7.5.1 Characteristics

 RS485 standard (2 wire, isolated)

 Address capability for 247 instruments in the same network (31 instruments maximum per

segment)

 Distance: 1000m (4000 feet)

 Baud rates: 1200, 2400, 4800, 9600 or 19200 bps.

 No. of bits : 8, no parity

 Stop bits: 1

 Response delay: 20ms max.

 Protocol: MODBUS (RTU)

7.5.2 Registers

The Field Logger configuration parameters are organized in a table of registers. Using the block

read capability of the protocol; many registers can be viewed in a single request command.

The user does not need to know the parameter position in the table as long as he uses the

Configurator software. A parameter is a word of 16 bits. The MODBUS command used for reading is:

03 - Read Holding Register

The following registers are equivalent to the holding registers (4X reference):

Holding

Registers

Parameter

0001 Channel 1 current reading

0002 Channel 2 current reading

0003 Channel 3 current reading

0004 Channel 4 current reading

0005 Channel 5 current reading

0006 Channel 6 current reading

0007 Channel 7 current reading

0008 Channel 8 current reading

0009 Alarm status

0010 Reserved: general status

0011 Channels 1 and 2 status

0012 Channels 3 and 4 status

0013 Channels 5 and 6 status

0014 Channels 7 and 8 status

1 2 ... 8 9 10 11 12 13 14 15 16

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