An unofficial summary of facts (addresses, types, units, scaling) from the maker's manual. Not affiliated with the maker; values can differ by firmware or model. Always check the device manual before writing (run commands, settings).
Default communication
| Protocol | Modbus RTU |
|---|---|
| Baud (factory) | 9600 bps — options: 1200, 2400, 4800, 9600, 19200, 38400 |
| Data · parity · stop | 8 · None · 1 |
| Slave ID (factory) | 31 (1~255) |
| Max per request | 16 registers |
| Manual address style | Wire address as is (0-based) |
- Addressing: the read example (p.224) sends 02 03 00 20 00 04 45 F0 to read 4 registers from 0020H (drive status 1); the write example (p.225) sends 01 10 00 01 00 02 04 00 01 17 70, writing 0001h (forward run) to 0001H and 1770h to 0002H (response 01 10 00 01 00 02 10 08). Manual address = frame address. CRCs of the read command, write response, error responses (02 83 03 F1 31, 01 90 02 CD C1) and loopback (01 08 00 00 A5 37 DA 8D) match calculation. The normal read response CRC is printed AF 82 but computes to D5 6B, and the write command CRC is printed 6D 67 but computes to 6D B7; this does not affect addressing.
- Only function codes 03H (read, up to 16 registers), 08H (loopback) and 10H (write multiple) — no 06H (p.222, p.224).
- Defaults: H5-01 address 1F (31), range 0-FF (0 = no response); H5-02 3 = 9600 bps (0-5 = 1200-38400); H5-03 0 = no parity (1 even, 2 odd); 8 data bits and 1 stop bit fixed, RTU only (p.212, p.217). Cycle power after changes.
- For RS-485 keep H5-07 = 1 (default); on the last drive set DIP switch S2 on the SI-485/J to ON (termination) (pp.214-216).
Registers (34)
«Wire» is the 0-based address in the request frame (PortDock's «0-based» notation). Value = raw × scale. Table: HR holding register, IR input register, CO coil, DI discrete input. Function codes in hex.
34
Swipe the table sideways — the first column (manual address) stays put.
| Manual | Wire | Table | Name | Type | Unit · scale | R/W | FC | Details |
|---|---|---|---|---|---|---|---|---|
| 0001H | 1 (0x0001) | HR | Operation signals and multi-function inputs | U16 | R/W | 03·10 | H5-12 default 0 (FWD/stop, REV/stop). Runs when run command source b1-02 = 2 (MEMOBUS) b0 Forward run (H5-12=0) / Run (H5-12=1) · b1 Reverse run (H5-12=0) / FWD-REV, 1 = reverse (H5-12=1) · b2 External fault (EF0) · b3 Fault reset · b4 Multi-function input 1 · b5 Multi-function input 2 · b6 Multi-function input 3 · b7 Multi-function input 4 · b8 Multi-function input 5 p.226 | |
| 0007H | 7 (0x0007) | HR | Analog output terminal AM setting | U16 | ×0.0006103515625 V | R/W | 03·10 | 10 V = 4000H (16384) p.226 |
| 0009H | 9 (0x0009) | HR | Multi-function digital output settings | U16 | R/W | 03·10 | b0 Contact output (MA-MB-MC) p.226 | |
| 000FH | 15 (0x000F) | HR | Control selection setting | U16 | R/W | 03·10 | b12 Terminal S5 input enabled p.226 | |
| 0020H | 32 (0x0020) | HR | Drive status 1 | U16 | R | 03 | b0 During run · b1 During reverse · b2 Drive ready · b3 Fault · b4 Data setting error · b5 Multi-function contact output (MA/MB-MC) · b14 ComRef enabled · b15 ComCtrl enabled p.227 | |
| 0021H | 33 (0x0021) | HR | Fault contents 1 | U16 | R | 03 | b0 Overcurrent (oC) · b1 Overvoltage (ov) · b2 Drive overload (oL2) · b3 Overheat 1 (oH1) · b4 Braking resistor overheat (rH) · b7 External fault EF0-5 · b8 Hardware fault CPF (includes oFx) · b9 Motor overload (oL1), overtorque detection 1 (oL3) · b11 Main circuit undervoltage (Uv) · b12 Undervoltage (Uv1), soft charge circuit fault (Uv3) · b13 Output phase loss (LF), input phase loss (PF) · b14 MEMOBUS/Modbus communication error (CE) · b15 Operator connection fault (oPr) p.227 | |
| 0022H | 34 (0x0022) | HR | Data link status | U16 | R | 03 | b0 Writing data or switching motors · b3 Upper or lower limit error · b4 Data conformity error · b5 Writing to EEPROM p.227 | |
| 0025H | 37 (0x0025) | HR | Output voltage reference | U16 | ×0.1 V | R | 03 | p.227 |
| 0029H | 41 (0x0029) | HR | Fault contents 2 | U16 | R | 03 | b2 Input phase loss (PF) · b3 Output phase loss (LF) · b4 Braking resistor overheat (rH) p.227 | |
| 002AH | 42 (0x002A) | HR | Alarm contents 1 | U16 | R | 03 | b2 Run command input error (EF) · b3 Drive baseblock (bb) · b4 Overtorque detection 1 (oL3) · b5 Heatsink overheat (oH) · b6 Overvoltage (ov) · b7 Undervoltage (Uv) · b9 MEMOBUS/Modbus communication error (CE) p.228 | |
| 002BH | 43 (0x002B) | HR | Input terminal status | U16 | R | 03 | b0 Terminal S1 closed · b1 Terminal S2 closed · b2 Terminal S3 closed · b3 Terminal S4 closed · b4 Terminal S5 closed p.228 | |
| 002CH | 44 (0x002C) | HR | Drive status 2 | U16 | R | 03 | b0 During run · b1 Zero speed · b2 Speed agree · b3 User speed agree · b4 Frequency detection 1 · b5 Frequency detection 2 · b6 Drive ready · b7 During undervoltage · b8 During baseblock · b9 Frequency reference from operator keypad · b10 Run command from operator keypad · b11 Overtorque · b14 Fault · b15 Communication timeout p.228 | |
| 002DH | 45 (0x002D) | HR | Output terminal status | U16 | R | 03 | b0 Multi-function contact output (MA/MB-MC) p.228 | |
| 0031H | 49 (0x0031) | HR | DC bus voltage | U16 | V | R | 03 | p.228 |
| 0034H | 52 (0x0034) | HR | Product code 1 (ASCII) | STRING(2) | R | 03 | «J0» for J1000 p.228 | |
| 003DH | 61 (0x003D) | HR | Communications error log | U16 | R | 03 | Kept until the fault is reset b0 CRC error · b1 Data length error · b3 Parity error · b4 Overrun error · b5 Framing error · b6 Timeout p.229 | |
| 003FH | 63 (0x003F) | HR | Output frequency (%) | U16 | ×0.01 % | R | 03 | p.229 |
| 0042H | 66 (0x0042) | HR | Output current (U1-03) | U16 | R | 03 | Via MEMOBUS/Modbus, 8192 = 100% of drive rated output current p.203, p.205 | |
| 0045H | 69 (0x0045) | HR | Output voltage (U1-06) | U16 | ×0.1 V | R | 03 | p.203 |
| 0046H | 70 (0x0046) | HR | DC bus voltage (U1-07) | U16 | V | R | 03 | p.203 |
| 004EH | 78 (0x004E) | HR | Terminal A1 input level (U1-13) | U16 | ×0.1 % | R | 03 | 100% at 10 V or 20 mA input p.204 |
| 007CH | 124 (0x007C) | HR | Capacitor maintenance (U4-05) | U16 | % | R | 03 | Replacement due at 100% p.204 |
| 007EH | 126 (0x007E) | HR | Cooling fan maintenance (U4-04) | U16 | % | R | 03 | Replacement due at 100% p.204 |
| 007FH | 127 (0x007F) | HR | Alarm code | U16 | R | 03 | All codes from Table C.5 1 = Undervoltage (Uv) · 2 = Overvoltage (ov) · 3 = Heatsink overheat (oH) · 5 = Overtorque 1 (oL3) · 7 = Run commands input error (EF) · 8 = Drive baseblock (bb) · 9 = External fault 3, terminal S3 (EF3) · 10 = External fault 4, terminal S4 (EF4) · 11 = External fault 5, terminal S5 (EF5) · 20 = MEMOBUS/Modbus communication error (CE) · 23 = Motor overload (oL1) · 24 = Drive overload (oL2) · 32 = MEMOBUS/Modbus test mode fault (SE) · 57 = External fault, terminal S1 (EF1) · 58 = External fault, terminal S2 (EF2) p.229, p.232 Table C.5 | |
| 0080H | 128 (0x0080) | HR | Current fault (U2-01) | U16 | R | 03 | Value is a fault code (all of Table C.4). Uv1 is not saved to the history 2 = Undervoltage (Uv1) · 4 = Soft charge circuit fault (Uv3) · 7 = Overcurrent (oC) · 8 = Overvoltage (ov) · 10 = Heatsink overheat (oH1) · 11 = Motor overload (oL1) · 12 = Drive overload (oL2) · 13 = Overtorque detection 1 (oL3) · 16 = Braking resistor overheat (rH) · 17 = External fault, terminal S3 (EF3) · 18 = External fault, terminal S4 (EF4) · 19 = External fault, terminal S5 (EF5) · 27 = Input phase loss (PF) · 28 = Output phase loss (LF) · 30 = Digital operator connection (oPr) · 31 = EEPROM write error (Err) · 33 = MEMOBUS/Modbus communication error (CE) · 39 = PROFIBUS-DP option external fault (EF0) · 66 = External fault 1, terminal S1 (EF1) · 67 = External fault 2, terminal S2 (EF2) · 70 = Current offset fault (CoF) · 131 = A/D conversion error (CPF02) · 135 = Drive specification mismatch after terminal/control board replacement (CPF06) · 137 = EEPROM serial communication fault (CPF08) · 140 = RAM fault (CPF11) · 141 = Flash memory circuit exception (CPF12) · 143 = Control circuit fault (CPF14) · 146 = Timing fault (CPF17) · 147 = Control circuit fault (CPF18) · 149 = Hardware fault at power up (CPF20) · 150 = Hardware fault at communication start up (CPF21) · 151 = A/D conversion fault (CPF22) · 152 = PWM feedback fault (CPF23) · 153 = Drive capacity signal fault (CPF24) · 257 = Option compatibility error (oFA00) p.204, p.232 Table C.4 | |
| 0081H | 129 (0x0081) | HR | Previous fault (U2-02) | U16 | R | 03 | Value is a fault code (all of Table C.4). Uv1 is not saved to the history 2 = Undervoltage (Uv1) · 4 = Soft charge circuit fault (Uv3) · 7 = Overcurrent (oC) · 8 = Overvoltage (ov) · 10 = Heatsink overheat (oH1) · 11 = Motor overload (oL1) · 12 = Drive overload (oL2) · 13 = Overtorque detection 1 (oL3) · 16 = Braking resistor overheat (rH) · 17 = External fault, terminal S3 (EF3) · 18 = External fault, terminal S4 (EF4) · 19 = External fault, terminal S5 (EF5) · 27 = Input phase loss (PF) · 28 = Output phase loss (LF) · 30 = Digital operator connection (oPr) · 31 = EEPROM write error (Err) · 33 = MEMOBUS/Modbus communication error (CE) · 39 = PROFIBUS-DP option external fault (EF0) · 66 = External fault 1, terminal S1 (EF1) · 67 = External fault 2, terminal S2 (EF2) · 70 = Current offset fault (CoF) · 131 = A/D conversion error (CPF02) · 135 = Drive specification mismatch after terminal/control board replacement (CPF06) · 137 = EEPROM serial communication fault (CPF08) · 140 = RAM fault (CPF11) · 141 = Flash memory circuit exception (CPF12) · 143 = Control circuit fault (CPF14) · 146 = Timing fault (CPF17) · 147 = Control circuit fault (CPF18) · 149 = Hardware fault at power up (CPF20) · 150 = Hardware fault at communication start up (CPF21) · 151 = A/D conversion fault (CPF22) · 152 = PWM feedback fault (CPF23) · 153 = Drive capacity signal fault (CPF24) · 257 = Option compatibility error (oFA00) p.204, p.232 Table C.4 | |
| 0098H | 152 (0x0098) | HR | Cumulative operation time (U4-01), 10 h units | U16 | ×10 h | R | 03 | For 12345 h: 0098H = 1234, 0099H = 5 p.229 |
| 0099H | 153 (0x0099) | HR | Cumulative operation time (U4-01), 1 h digit | U16 | h | R | 03 | p.229 |
| 00B6H | 182 (0x00B6) | HR | Frequency reference after soft-starter (%) | U16 | ×0.01 % | R | 03 | p.229 |
| 00B8H | 184 (0x00B8) | HR | Frequency reference (%) | U16 | ×0.01 % | R | 03 | p.229 |
| 00BFH | 191 (0x00BF) | HR | oPE error number | U16 | R | 03 | p.229 | |
| 00C0H | 192 (0x00C0) | HR | Fault contents 1 (detail) | U16 | R | 03 | b1 Undervoltage (Uv1) · b3 Soft charge circuit fault (Uv3) · b6 Overcurrent (oC) · b7 Overvoltage (ov) · b9 Heatsink overheat (oH1) · b10 Motor overload (oL1) · b11 Drive overload (oL2) · b12 Overtorque detection 1 (oL3) · b15 Braking resistor overheat (rH) p.229 | |
| 00C1H | 193 (0x00C1) | HR | Fault contents 2 (detail) | U16 | R | 03 | b0 External fault, terminal S3 (EF3) · b1 External fault, terminal S4 (EF4) · b2 External fault, terminal S5 (EF5) · b10 Input phase loss (PF) · b13 Digital operator connection fault (oPr) · b14 EEPROM write error (Err) p.229 | |
| 0900H | 2304 (0x0900) | HR | Enter command (save to EEPROM) | U16 | W | 10 | Write 0. Reading returns error 02H. EEPROM limited to 100,000 writes. Without it, parameters changed by communication stay in RAM only and are lost at power off p.233 Table C.6 |
Notes
- To run and set frequency by communication set b1-02 = 2 and b1-01 = 2 (p.220 Table C.1).
- Frequency reference 0002H, frequency reference monitor 0023H and output frequency 0024H are not included: the table (pp.226-227) says their unit is set by H5-13, whose default 0 is «0.1Hz / 1» (p.219), but the write example in the same manual (p.225) gives 1770h (6000) as 60.00 Hz, so the scaling disagrees. Because H5-13 also sets the «frequency monitor unit», U1-01/U1-02 (0040H/0041H, 0.01 Hz in the table on p.203) are left out too. Read frequency through 00B8H and 003FH, whose unit is fixed at 0.01%.
- Output current 0026H and drive rated current 00ABH have no unit in the table (p.227, p.229) and are left out (use 0042H, 8192 = 100% rated). U4-01 at 004CH is also left out: the monitor table (p.204) says 1 h units while footnote <3> (p.205) says the communication value is in 10 h units, so read 0098H/0099H instead.
- Parameters changed by communication are applied to RAM only; write 0 to 0900H to keep them (p.233). Parameter addresses are in the Addr. Hex column of the Appendix B tables.
Read it with PortDock
- Install the free PortDock Modbus Master and connect with the device's settings.
- On the table toolbar, «Device profile…» → pick this device → «Load». Polling tables, names, types and the Slave ID are filled in (optionally the serial settings too).
- Names carry the unit and scale (e.g. «×0.01 Hz»). Values on screen are raw — multiply by the scale.
- To test your program without the device, PortDock Modbus Slave's «Emulate device…» serves the same map with example values.
Download JSON
- yaskawa/j1000.json (GitHub raw) · copy on this site · history
- schema.json — format (JSON Schema). table, address (0-based), type and order match the PortDock CSV.
- License: CC BY 4.0 — please cite:
PortDock device register maps, v2026.10 · 09ac1d0b2792, https://portdock.dev/devices/
and this page. LICENSE · data bundle, version and changelog - Found a mistake? Please open a GitHub issue with the manual page.
Sources
- YASKAWA AC Drive-J1000 Compact V/f Control Drive Technical Manual (SIEP C710606 31D) — YASKAWA ELECTRIC CORPORATION, SIEP C710606 31D <3>, published May 2015 · Appendix C MEMOBUS/Modbus pp.210-235, U monitor table pp.203-205 · checked 2026-10-24