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Phase 3 PR 49 -- Per-device FC03/FC16 register caps with auto-chunking
Phase 3 PR 49 -- Per-device FC03/FC16 register caps with auto-chunking
Phase 3 PR 48 -- DL205 CDAB float word order end-to-end test
f306793e36
Merge pull request 'Phase 3 PR 48 -- DL205 CDAB float word order end-to-end test' (#47) from phase-3-pr48-dl205-cdab-float into v2
463c5a4320
Phase 3 PR 48 -- DL205 CDAB word order for Float32 end-to-end test. The driver has supported ModbusByteOrder.WordSwap (CDAB) since PR 24 for all multi-register types -- the underlying word-swap code path was already there. PR 48 closes the loop with an integration test that validates it end-to-end against the dl205 pymodbus profile: HR[1056..1057] stores IEEE-754 1.5f with the low word at the lower address (0x0000 at HR[1056], 0x3FC0 at HR[1057]). Reading with WordSwap returns 1.5f; reading with BigEndian returns a tiny denormal (~5.74e-41) -- a silent "value is 0" bug that typically surfaces in the field only when an operator notices a setpoint readout stuck at 0 while the PLC display shows the real value. Test asserts both: WordSwap==1.5f AND BigEndian!=1.5f, proving the flag is not a no-op. No driver code changes -- the word-swap normalization at NormalizeWordOrder() has handled Float32/Int32/UInt32 correctly since PR 24 and the unit test suite already covers it (Int32_WordSwap_decodes_CDAB_layout + Float32 equivalent). This PR exists primarily to lock in the integration-level validation so future refactors of the codec don't silently break DL205/DL260 floats. 6/6 DL205 integration tests pass with MODBUS_SIM_PROFILE=dl205.
Phase 3 PR 48 -- DL205 CDAB float word order end-to-end test
9e61873cc0
Merge pull request 'Phase 3 PR 47 -- DL205 V-memory octal-address helper' (#46) from phase-3-pr47-dl205-vmemory into v2
2b5222f5db
Phase 3 PR 47 -- DL205 V-memory octal-address helper. Adds DirectLogicAddress static class with two entry points: UserVMemoryToPdu(string) parses a DirectLOGIC V-address (V-prefixed or bare, whitespace tolerated) as OCTAL and returns the 0-based Modbus PDU address. V2000 octal = decimal 1024 = PDU 0x0400, which is the canonical start of the user V-memory bank on DL205/DL260. SystemVMemoryBasePdu + SystemVMemoryToPdu(ushort offset) handle the system bank (V40400 and up) which does NOT follow the simple octal-to-decimal formula -- the CPU relocates the system bank to PDU 0x2100 in H2-ECOM100 absolute mode. A naive caller converting 40400 octal would land at PDU 0x4100 (decimal 16640) and miss the system registers entirely; the helper routes the correct 0x2100 base. Why this matters: DirectLOGIC operators think in OCTAL (the ladder-logic editor, the Productivity/Do-more UI, every AutomationDirect manual addresses V-memory octally) while the Modbus wire is DECIMAL. Integrators routinely copy V-addresses from the PLC documentation into client configs and read garbage because they treated V2000 as decimal 2000 (HR[2000] = 0 in the dl205 sim, zero in most PLCs). The helper makes the translation explicit per the D2-USER-M appendix + H2-ECOM-M \u00A76.5 references cited in docs/v2/dl205.md. Unit tests: UserVMemoryToPdu_converts_octal_V_prefix (V0, V1, V7, V10, V2000, V7777, V10000, V17777 -- the exact sweep documented in dl205.md), UserVMemoryToPdu_accepts_bare_or_prefixed_or_padded (case + whitespace tolerance), UserVMemoryToPdu_rejects_non_octal_digits (V8/V19/V2009 must throw ArgumentException with 'octal' in the message -- .NET has no base-8 int.Parse so we hand-walk digits to catch 8/9 instead of silently accepting them), UserVMemoryToPdu_rejects_empty_input, UserVMemoryToPdu_overflow_rejected (200000 octal = 0x10000 overflows ushort), SystemVMemoryBasePdu_is_0x2100_for_V40400, SystemVMemoryToPdu_offsets_within_bank, SystemVMemoryToPdu_rejects_overflow. 23/23 Modbus.Tests pass. Integration tests against dl205.json pymodbus profile: DL205_V2000_user_memory_resolves_to_PDU_0x0400_marker (reads HR[0x0400]=0x2000), DL205_V40400_system_memory_resolves_to_PDU_0x2100_marker (reads HR[0x2100]=0x4040). 5/5 DL205 integration tests pass. Caller opts into the helper per tag by calling DirectLogicAddress.UserVMemoryToPdu("V2000") as the ModbusTagDefinition Address -- no driver-wide "DL205 mode" flag needed, because users mix DL and non-DL tags in a single driver instance all the time.
Phase 3 PR 47 -- DL205 V-memory octal-address helper
Phase 3 PR 47 -- DL205 V-memory octal-address helper
1a60470d4a
Merge pull request 'Phase 3 PR 46 -- DL205 BCD decoder' (#45) from phase-3-pr46-dl205-bcd into v2
8248b126ce
Phase 3 PR 46 -- DL205 BCD decoder (binary-coded-decimal numeric encoding). Adds ModbusDataType.Bcd16 and Bcd32 to the driver. Bcd16 is 1 register wide, Bcd32 is 2 registers wide; Bcd32 respects ModbusByteOrder (BigEndian/WordSwap) the same way Int32 does so the CDAB-style families (including DL205/DL260 themselves) can be configured. DecodeRegister uses the new internal DecodeBcd helper: walks each nibble from MSB to LSB, multiplies the running result by 10, adds the nibble as a decimal digit. Explicitly rejects nibbles > 9 with InvalidDataException -- hardware sometimes produces garbage during write-in-progress transitions and silently returning wrong numeric values would quietly corrupt the caller's data. EncodeRegister's new EncodeBcd inverts the operation (mod/div by 10 nibble-by-nibble) with an up-front overflow check against 10^nibbles-1. Why this matters for DL205/DL260: AutomationDirect DirectLOGIC uses BCD as the default numeric encoding for timers, counters, and operator-display numerics (not binary). A plain Int16 read of register 0x1234 returns 4660; the BCD path returns 1234. The two differ enough that silently defaulting to Int16 would give wildly wrong HMI values -- the caller must opt in to Bcd16/Bcd32 per tag. Unit tests: DecodeBcd (theory: 0,1,9,10,1234,9999), DecodeBcd_rejects_nibbles_above_nine, EncodeBcd (theory), Bcd16_decodes_DL205_register_1234_as_decimal_1234 (control: same bytes as Int16 decode to 4660), Bcd16_encode_round_trips_with_decode, Bcd16_encode_rejects_out_of_range_values, Bcd32_decodes_8_digits_big_endian, Bcd32_word_swap_handles_CDAB_layout, Bcd32_encode_round_trips_with_decode, Bcd_RegisterCount_matches_underlying_width. 66/66 Modbus.Tests pass. Integration test: DL205BcdQuirkTests.DL205_BCD16_decodes_HR1072_as_decimal_1234 against dl205.json pymodbus profile (HR[1072]=0x1234). Asserts Bcd16 decode=1234 AND Int16 decode=0x1234 on the same wire bytes to prove the paths are distinct. 3/3 DL205 integration tests pass with MODBUS_SIM_PROFILE=dl205.
Phase 3 PR 46 -- DL205 BCD decoder
Phase 3 PR 46 -- DL205 BCD decoder
635f67bb02
Merge pull request 'Phase 3 PR 45 -- DL205 string byte-order quirk' (#44) from phase-3-pr45-dl205-string-byte-order into v2
cd19022d19
Phase 3 PR 45 -- DL205 string byte-order quirk (low-byte-first ASCII packing). Adds ModbusStringByteOrder enum {HighByteFirst, LowByteFirst} + StringByteOrder field on ModbusTagDefinition (default HighByteFirst, the standard Modbus convention). DecodeRegister + EncodeRegister String branches now respect per-tag byte order. Under LowByteFirst each register packs the first char in the low byte instead of the high byte -- the AutomationDirect DirectLOGIC DL205/DL260/DL350 family's headline string quirk. Without the flag the driver decodes 'eHllo' garbage from HR[1040..1042] even though wire bytes are identical. Unit tests: String_LowByteFirst_decodes_DL205_packed_Hello (5 chars across 3 regs with nul pad), String_LowByteFirst_decode_truncates_at_first_nul, String_LowByteFirst_encode_round_trips_with_decode (asserts exact DL205-documented byte sequence {0x65,0x48,0x6C,0x6C,0x00,0x6F} + symmetric encode->decode), String_HighByteFirst_and_LowByteFirst_differ_on_same_wire (control: same wire, different flag => different decode). 56/56 Modbus.Tests pass. Integration test: DL205StringQuirkTests.DL205_string_low_byte_first_decodes_Hello_from_HR1040 against the dl205.json pymodbus profile; reads HR[1040..1042] with both flags on the same tag map and asserts LowByteFirst='Hello' + HighByteFirst!='Hello'. Gated on MODBUS_SIM_PROFILE=dl205 since the standard profile doesn't seed HR[1040..1042]. Verified 2/2 integration tests pass against running pymodbus dl205 simulator. Baseline for PR 46 (BCD decoder), PR 47 (V-memory octal helper), PR 48 (CDAB float order), PR 49 (FC03/FC16 per-device caps) -- each lands its own DL205_<behavior> test class in tests/.../DL205/.
Phase 3 PR 45 -- DL205 string byte-order quirk
Phase 3 PR 45 -- DL205 string byte-order quirk
a3f2f95344
Phase 3 PR 49 -- Per-device FC03/FC16 register caps with auto-chunking. Adds MaxRegistersPerRead (default 125, spec max) + MaxRegistersPerWrite (default 123, spec max) to ModbusDriverOptions. Reads that exceed the cap automatically split into consecutive FC03 requests: the driver dispatches chunks of [cap] regs at incrementing addresses, copies each response into an assembled byte[] buffer, and hands the full payload to DecodeRegister. From the caller's view a 240-char string read against a cap-100 device is still one Read() call returning one string -- the chunking is invisible, the wire shows N requests of cap-sized quantity plus one tail chunk. Writes are NOT auto-chunked. Splitting an FC16 across two transactions would lose atomicity -- mid-split crash leaves half the value written, which is strictly worse than rejecting upfront. Instead, writes exceeding MaxRegistersPerWrite throw InvalidOperationException with a message naming the tag + cap + the caller's escape hatch (shorten StringLength or split into multiple tags). The driver catches the exception internally and surfaces it to IWritable as BadInternalError so the caller pattern stays symmetric with other failure modes. Per-family cap cheat-sheet (documented in xml-doc on the option): Modbus-TCP spec = 125 read / 123 write, AutomationDirect DL205/DL260 = 128 read / 100 write (128 exceeds spec byte-count capacity so in practice 125 is the working ceiling), Mitsubishi Q/FX3U = 64 / 64, Omron CJ/CS = 125 / 123. Not all PLCs reject over-cap requests cleanly -- some drop the connection silently -- so having the cap enforced client-side prevents the hard-to-diagnose 'driver just stopped' failure mode. Unit tests: Read_within_cap_issues_single_FC03_request (control: no unnecessary chunking), Read_above_cap_splits_into_two_FC03_requests (120 regs / cap 100 -> 100+20, asserts exact per-chunk (Address,Quantity) and end-to-end payload continuity starting with register[100] high byte = 'A'), Read_cap_honors_Mitsubishi_lower_cap_of_64 (100 regs / cap 64 -> 64+36), Write_exceeding_cap_throws_instead_of_splitting (110 regs / cap 100 -> status != 0 AND Fc16Requests.Count == 0 to prove nothing was sent), Write_within_cap_proceeds_normally (control: cap honored on short writes too). Tests use a new RecordingTransport that captures the (Address, Quantity) tuple of every FC03/FC16 request so the chunk layout is directly assertable -- the existing FakeTransport does not expose request history. 103/103 Modbus.Tests pass; 6/6 DL205 integration tests still pass against the live pymodbus dl205 profile with MODBUS_SIM_PROFILE=dl205.
dohertj2
created branch phase-3-pr48-dl205-cdab-float in dohertj2/lmxopcua
2026-04-18 22:00:37 -04:00
463c5a4320
Phase 3 PR 48 -- DL205 CDAB word order for Float32 end-to-end test. The driver has supported ModbusByteOrder.WordSwap (CDAB) since PR 24 for all multi-register types -- the underlying word-swap code path was already there. PR 48 closes the loop with an integration test that validates it end-to-end against the dl205 pymodbus profile: HR[1056..1057] stores IEEE-754 1.5f with the low word at the lower address (0x0000 at HR[1056], 0x3FC0 at HR[1057]). Reading with WordSwap returns 1.5f; reading with BigEndian returns a tiny denormal (~5.74e-41) -- a silent "value is 0" bug that typically surfaces in the field only when an operator notices a setpoint readout stuck at 0 while the PLC display shows the real value. Test asserts both: WordSwap==1.5f AND BigEndian!=1.5f, proving the flag is not a no-op. No driver code changes -- the word-swap normalization at NormalizeWordOrder() has handled Float32/Int32/UInt32 correctly since PR 24 and the unit test suite already covers it (Int32_WordSwap_decodes_CDAB_layout + Float32 equivalent). This PR exists primarily to lock in the integration-level validation so future refactors of the codec don't silently break DL205/DL260 floats. 6/6 DL205 integration tests pass with MODBUS_SIM_PROFILE=dl205.
2b5222f5db
Phase 3 PR 47 -- DL205 V-memory octal-address helper. Adds DirectLogicAddress static class with two entry points: UserVMemoryToPdu(string) parses a DirectLOGIC V-address (V-prefixed or bare, whitespace tolerated) as OCTAL and returns the 0-based Modbus PDU address. V2000 octal = decimal 1024 = PDU 0x0400, which is the canonical start of the user V-memory bank on DL205/DL260. SystemVMemoryBasePdu + SystemVMemoryToPdu(ushort offset) handle the system bank (V40400 and up) which does NOT follow the simple octal-to-decimal formula -- the CPU relocates the system bank to PDU 0x2100 in H2-ECOM100 absolute mode. A naive caller converting 40400 octal would land at PDU 0x4100 (decimal 16640) and miss the system registers entirely; the helper routes the correct 0x2100 base. Why this matters: DirectLOGIC operators think in OCTAL (the ladder-logic editor, the Productivity/Do-more UI, every AutomationDirect manual addresses V-memory octally) while the Modbus wire is DECIMAL. Integrators routinely copy V-addresses from the PLC documentation into client configs and read garbage because they treated V2000 as decimal 2000 (HR[2000] = 0 in the dl205 sim, zero in most PLCs). The helper makes the translation explicit per the D2-USER-M appendix + H2-ECOM-M \u00A76.5 references cited in docs/v2/dl205.md. Unit tests: UserVMemoryToPdu_converts_octal_V_prefix (V0, V1, V7, V10, V2000, V7777, V10000, V17777 -- the exact sweep documented in dl205.md), UserVMemoryToPdu_accepts_bare_or_prefixed_or_padded (case + whitespace tolerance), UserVMemoryToPdu_rejects_non_octal_digits (V8/V19/V2009 must throw ArgumentException with 'octal' in the message -- .NET has no base-8 int.Parse so we hand-walk digits to catch 8/9 instead of silently accepting them), UserVMemoryToPdu_rejects_empty_input, UserVMemoryToPdu_overflow_rejected (200000 octal = 0x10000 overflows ushort), SystemVMemoryBasePdu_is_0x2100_for_V40400, SystemVMemoryToPdu_offsets_within_bank, SystemVMemoryToPdu_rejects_overflow. 23/23 Modbus.Tests pass. Integration tests against dl205.json pymodbus profile: DL205_V2000_user_memory_resolves_to_PDU_0x0400_marker (reads HR[0x0400]=0x2000), DL205_V40400_system_memory_resolves_to_PDU_0x2100_marker (reads HR[0x2100]=0x4040). 5/5 DL205 integration tests pass. Caller opts into the helper per tag by calling DirectLogicAddress.UserVMemoryToPdu("V2000") as the ModbusTagDefinition Address -- no driver-wide "DL205 mode" flag needed, because users mix DL and non-DL tags in a single driver instance all the time.