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carlos_mendez

@carlos_mendez

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My Discussions & Topics

Manage, track, and update the status of your technical questions and engineering discussions.

17 Topics New Topic

Dynamic Rolling Single-Action Schedules vs Firmware OTA: Ingenious Workaround or Field Maintenance Nightmare?

General Discussion 6 replies 50 views 2026-08-24T08:55:12.723Z

dlms cosem class-22 class-10 architecture

Why does Disconnect Control (Class 70) Method 2 return Success (0x00) while output_state remains false?

General Discussion 4 replies 46 views 2026-08-24T08:52:05.018Z

dlms cosem class-70 relaycontrol fieldtriage

Why does Class 22 Single Action Schedule (0.0.15.0.1.255) return read-write-denied on multi-element execution_time arrays?

General Discussion 4 replies 44 views 2026-08-24T08:29:05.847Z

dlms cosem class-22 class-9 class-70

What are the mapping models and concurrency architectures for translating IEC 60870-5-104 telecontrol to DLMS/COSEM?

General Discussion 4 replies 35 views 2026-08-23T03:53:05.456Z

iec104 telecontrol gateway dlms distributionaut

What essential field debugging tools and hardware isolators do engineers carry for substation DLMS captures?

General Discussion 4 replies 17 views 2026-08-23T03:51:41.836Z

fieldengineerin hardwaretools troubleshooting substation rs485

What is the standard intuitive structure of OBIS 6-tuple codes (A.B.C.D.E.F) in Blue Book?

General Discussion 3 replies 18 views 2026-08-23T03:51:20.405Z

beginner obis bluebook cosem iec62056-62

Why does sending SNRM frame 7E A0 0A... result in timeout with no response over optical probe?

General Discussion 3 replies 14 views 2026-08-23T03:50:56.965Z

beginner hdlc snrm opticalprobe iec62056-46

Why does mixed-mode HLS 5 association fail with scope-of-access-violated when reading Class 70 or Class 8?

General Discussion 10 replies 44 views 2026-08-22T17:21:29.315Z

dlms cosem association-ln access-rights security-suite

Why does setting DLMS execution_time (Class 22 / Class 20) with wildcards 0xFF or 0x00 trigger continuous 1Hz firing or 32-bit overflow bugs?

General Discussion 10 replies 53 views 2026-08-22T17:01:14.074Z

dlms cosem class-20 class-22 activity-calend

HighGMAC AARE is accepted, but GET still fails — am I treating HLS like LOW authentication?

General Discussion 4 replies 22 views 2026-08-22T12:44:24.869Z

high-gmac hls aarq association-ln dlms-security

DLMS/COSEM Prepayment Balance Accounting: Class 72 (Account Interface) Explained

General Discussion 3 replies 13 views 2026-08-22T12:39:38.221Z

account-interfa class-72 prepayment currency-scalin

Multi-Utility M-Bus Meter Pairing (Gas, Water, Heat) via DLMS Class 74 (M-Bus Setup)

General Discussion 3 replies 13 views 2026-08-22T12:39:21.973Z

m-bus wireless-m-bus gas-meter water-meter multi-utility

DLMS Modem Configuration (Class 45 - Auto Connect & Auto Answer) over 4G/NB-IoT

General Discussion 3 replies 13 views 2026-08-22T12:37:46.486Z

auto-connect class-45 modem cellular apn

PLC (G3-PLC / PRIME) Media MAC Framing & Intermittent DLMS Timeouts

General Discussion 2 replies 13 views 2026-08-22T12:36:55.881Z

plc g3-plc prime smart-grid noise-filtering

RS-485 Multi-Drop Bus Reflection and Biasing Issues in Smart Meter Substation Loops

General Discussion 2 replies 10 views 2026-08-22T12:36:18.651Z

rs485 hardware substation termination signal-integrit

DLMS/COSEM Prepayment Token Carrier Management (Class 67 - Credit Interface)

General Discussion 2 replies 10 views 2026-08-22T12:33:47.367Z

prepayment class-67 sts token-carrier smart-pay

IEC 62056-21 Mode E Optical Probe Sign-On and Baud Rate Switch Failure

General Discussion 3 replies 14 views 2026-08-22T12:33:01.823Z

optical-probe iec-62056-21 mode-e baudrate serial

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