Calculating Multidrop Id For The Veryco meter

Avatar

sdg.hope
2026-03-23 09:27

  • HDLC Address Calculation for RS485 Multidrop
  • User example : VC1100 Meter ? Addressing Guidance

  • 1. Introduction

  • When configuring multidrop communication over RS485 for the VC1100 meter, each meter must have a unique HDLC address to ensure proper communication on the bus.
  • This document explains:
  • How the HDLC address is derived
  • Whether the address is calculated or configured
  • Step-by-step calculation method

  • 2. Understanding the Addressing Structure

  • 2.1 Upper HDLC Address
  • The Upper HDLC address is fixed as: 0x00 0x02
  • 2.2 Lower HDLC Address
  • The Lower HDLC address is derived from the meter?s serial number.
  • The calculation is based on:
  • The last 5 decimal digits of the serial number
  • A modulus operation using 15000
  • This calculated value becomes the HDLC address corresponding to the serial number.
  • Please note: If the last five decimal digits are less than 17, add 15000 to that value. The result will be the lower HDLC address.
  • Example: Serial number ending in 00011 → 11 < 17 → 11 + 15000 = 15011
  • 3. Address Calculation Procedure

  • Follow the steps below to calculate the HDLC address:
  • Step 1: Extract the Last 5 Digits
  • Take the last five (5) decimal digits of the meter?s serial number.

  • Example format:
  • Meter Serial Number: 026129141324
  • Last 5 Digits: 41324
  • Step 2 ? Modulus 15000:
  • Perform the following calculation:
  • Remainder = (Last 5 Digits) % 15000
  • Where % represents the modulus (remainder after division).
  • Example :
  • 41324 % 15000 = 11324 (Which is the remainder)
  • Please view Image on the folder as references.

  •  


    • Tags: multidrop idveryco
    Please log in to post a comment
    multidrop id:veryco: