Ritron DATAFLOW RTU Series Guia do Utilizador descarregar pdf (Página 36)

DATAFLOW RTU

6. MODBUS MEMORY MAP

6.1 The DATAFLOW RTU supports three types of MODBUS messages; it will recognize:

· READ OUTPUT REGISTER function code 03

· PRESET SINGLE REGISTER function code 06

· PRESET MULTIPLE REGISTER function code 10 (hexadecimal).

All other messages will be ignored.

6.2 The DATAFLOW RTU operates in the MODBUS RTU mode with 8 data bits, 1 stop bit

and no parity bit.

6.3 The DATAFLOW RTU accesses MODBUS information by two different methods:

· Direct data access, which involves direct polling of the RTUs registers. When

this method is used, RTUs not directly connected to the MODBUS controller are

polled via the RF link. NOTE: Direct data access can result in unacceptably high

levels of RF traffic.

· Stored data method, in which copies of the current state of each RTU in the

system is stored in the memory of the RTU connected to the MODBUS

controller. Having current data stored eliminates the need to poll RF.

NOTE: For a more detailed explanation of these two methods, refer to Examples 6

and 7 in the following section of this manual.

6.3.1 Following is a M

ODBUS memory map of the DATAFLOW RTU for direct data access.

RTU REGISTER RTU ADDRESS (HEX) DATA RANGE

INPUT 1 0050 00H to FFH

INPUT 2 0051 00H to FFH

INPUT 3 0052 00H to FFH

INPUT 4 0053 00H to FFH

INPUT 5 0054 00H to FFH

INPUT 6 0055 00H to FFH

INPUT VOLTAGE 0056 00H to FFH

RSSI 0057 07H to 50H

ANALOG OUTPUT 2 009C 00H to FFH

ANALOG OUTPUT 1 009D 00H to FFH

DIGITAL OUTPUTS 009E 00H to 03H

DIGITAL 1 OUTPUT OPEN 000000X0 B

DIGITAL 1 OUTPUT CLOSED 000000X1 B

DIGITAL 2 OUTPUT OPEN 0000000X B

DIGITAL 2 OUTPUT CLOSED 0000001X B

XMIT CONTROL 00C5

XMIT OFF 01 to FF H

XMIT ON 00 H

XMIT TEST 00C2 00H to 0FH

ì P CHECKSUM 005F

SELFTEST REGISTER 00C8

CLOCK TEST FAIL 1XXXXXXX B

CLOCK TEST PASS 0XXXXXXX B

RAM TEST FAIL X1XXXXXX B

RAM TEST PASS X0XXXXXX B

( B-11 )

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 62 63

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