US_XX. Sices GATEWAY Modbus/TCP

This code identifies unsigned numerical information associated with a max of 16 bits. Some few bits could represent the decimal part of the numerical information. Th e “XX” field indicates the number of decimal bits. This type of information uses always a single register.

The minimal register value, in this format, is zero.

The max value is 65535 ((2^16)-1) divided by two raised to the number of decimal bits.

N° of decimal bits Formula Maximum value

0

4

65535 / (2^0)

65535 / (2^4)

65535

4095,9375

8

12

65535 / (2^8)

65535 / (2^12)

255,99609375

15,999755859375

Few examples follow:

1)

US_00 (no decimals)

While reading 11405 (0x2C8D) from the MODBUS register, to find the actual value it is needed to: a) divide by two rose to the number of digital bits  11405/ (2^0) = 11405.

I.e. the register number 11405 represents actually the value 11405.

2) US_08 (eight decimal bits).

While reading 11405 (0x2C8D) from the MODBUS register, to find the actual value it is needed to: a) divide by two raised to the number of digital bits 11405 / (2^8) = 44,55078125.

I.e. the number 11405 represents the value 44,55078125.

This code identifies unsigned information using up to 32 bits. Some few bits might represent the decimal part of the information. The field “XX” indicates the number of decimal bits. The information uses always two registers.

The minimum information value in this format is zero.

The max information value is 4294967295 ((2^32)-1) divided by two raised to the number of digital bits.

N° of decimal bits Formula

0 4294967295 / (2^0)

Max value

4294967295

8

16

24

4294967295 / (2^8) 16777215,99609375

4294967295 / (2^16) 65535,9999847412109375

4294967295 / (2^24) 255,999999940395355224609375

Some few examples follow:

1) UL_00 (no decimal bits).

While reading 34464 in the lower index register and 1 in the upper index register, to find the actual value it is needed to: a) Multiply the upper register by (2^16)  1*65536 = 65536 b) Sum the lower register  65536+34464 = 100000 c) Divide by two raised to the number of digital bits  100000 / (2^0) = 100000

Therefore the couple of registers: 34464 (lower) and 1 (upper) represent the value

100000.

2) UL_08 (eight decimal bits).

While reading 34464 in the lower index register and 1 in the upper index register, to find the actual value it is needed to: a) Multiply the upper register by (2^16)  1*65536 = 65536 b) Sum the lower register  65536+34464 = 100000 c) Divide by two raised to the number of decimal bits  100000 / (2^8) = 390,625

Therefore the couple of registers 34464 (lower) e 1 (upper) represent the value 390,625.

USER MANUAL 15