Onicon F-2600 Instrukcja Użytkownika Pobierz pdf (Strona 83)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 83

The following four selections are available in this menu. When selecting an item, the

protocol is changed immediately without having to press the ENTER key.

0-1:2-3 Most signicant register rst, most signicant byte rst (default)

2-3:0-1 Least signicant register rst, least signicant byte rst

1-0:3-2 Most signicant register rst, least signicant byte rst

3-2:1-0 Least signicant register rst, most signicant byte rst

Table 2. Byte Order

Note that all of the registers are affected by the byte order, including strings and registers

representing 16-bit integers. The register order only affects the order of those registers

representing 32-bit oating point and long integer data, but does not affect single 16-bit

integers or strings.

Modbus Protocol

The Modbus RTU protocol is supported in this implementation. Supported baud rates are

1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200. The default baud rate is 19200

baud. Depending upon the Modbus protocol selected, data is transmitted in 8-bit data

frames with even or odd parity and 1 stop bit or no parity and 2 or 1 (non-standard) stop

bits.

The current Modbus protocol specication does not dene register usage, but there is an

informal register numbering convention derived from the original (now obsolete) Modicon

Modbus protocol specication which is still used by many vendors of Modbus capable

products.

Registers Usage Valid Function Codes

00001–09999 Read/write bits ("coils") 01 (read coils) 05 (write single

coil) 15 (write multiple coils)

10001–19999 Read-only bits ("discrete inputs") 02 (read discrete inputs)

30001–39999 Read-only 16 bit registers ("input

registers"), IEEE 754 oating point

encoded as two ASCII characters per

16-bit register

03 (read holding registers) 04

(read input registers)

40001–49999 Read/write 16-bit registers ("holding

registers"), IEEE 754 oating point

encoded as two ASCII characters per

16-bit register

03 (read holding registers) 06

(write single register) 16 (write

multiple registers)

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 130 131

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Onicon F-2600 Instrukcja Użytkownika Strona 83