Sensia CamCor, Protocol Manual

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Section 2—Data Types
Data Formats
Various data types are implemented in the CamCor CT Series and PRO Series Coriolis meters. The following table lists
the formats and the numbers of bytes and registers associated with each type.
Table 2.1—CamCor Data Formats
Data Format Data Type Byte Count Register Count
16-bit Floating Point (FP) 4 2
Unsigned Short Integer (U8) 2 1
Unsigned Integer (U16) 2 1
Unsigned Long Integer (U32) 4 2
Packed ASCII Packed ASCII (PAC) See Packed ASCII below
The word ordering for multiple register data types, such as floating-point numbers or long integers, places the most sig -
nificant word first in the message.
Unsigned Short Integer
The protocol for the CamCor Coriolis meters is based on a 16-bit data format. The value for “U8–Unsigned Short Inte -
ger” is appended with 0x00. For example, if the value stored on the device is 125 (0x7D), the Standard Modbus Function
Code 3 response is “0x007D.”
Packed ASCII
On CamCor meters, Packed ASCII uses three bytes to store four characters. For example, character string “ABCD” is
stored as “0x0420C4” in Packed ASCII.
Table 2.2—CamCor Packed ASCII Code
Data Format
Data Appearance
Byte
0x04 0x20 0xC4
Bit 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 1 0 0
Character* A(1) B(2) C(3) D(4)
*The value inside parentheses is the Packed ASCII Code.
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CamCor
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Modbus Protocol Section 2