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) | 4800 bps — options: 4800, 9600, 19200 |
| Data · parity · stop | 8 · None · 1 |
| Slave ID (factory) | 1 (1~32) |
| 32-bit order | ABCD |
| Manual address style | 1-based numbers (wire address + 1) |
- Addressing: coil and register numbers in the manual are 1-based, and each example notes «the start address is 1 smaller than the number» (pp.4-83 to 4-89). Examples: read coils (p.4-83) 08 01 00 06 00 05 1C 91 → coils from 0007h (multi-function input 1); read registers (pp.4-84 to 4-85) 01 03 00 11 00 06 95 CD → 0012h-0017h (trip monitor 1); write coil (p.4-86) 08 05 00 00 FF 00 8C A3 → coil 0001h (RUN command); FC06 (pp.4-86 to 4-87) 08 06 10 28 01 F4 0D 8C → 500 to 1029h (A020); FC10 (pp.4-88 to 4-89) 08 10 10 13 00 02 04 00 04 93 E0 7D 53 → 300000 to 1014h/1015h (F002). The CRCs of these frames, of the responses (08 01 01 05 92 17; 01 03 0C 00 03 00 00 00 63 00 00 00 1E 01 1C AF 6D; 08 0F 00 06 00 05 75 50; 08 10 10 13 00 02 B4 54) and of write coils (08 0F 00 06 00 05 02 17 00 83 EA) all match calculation.
- Function codes 01h, 03h, 05h, 06h, 08h, 0Fh and 10h; no 02h/04h, so read-only status is read as coils (01h). The function code table (p.4-81) limits 03h/10h to 4 registers (8 bytes), but the read example in the same manual (p.4-84) reads 6 (0Ch bytes), so maxRegisters is left empty; reading 4 or fewer is safe.
- Defaults: C070 02 = operator (03 for Modbus), C071 04 = 4800 bps, C072 station 1 (1-32), C074 00 = no parity, C075 1 = 1 stop bit, 8 data bits fixed (pp.4-77, 4-79). C07x cannot be changed through Modbus; set them on the operator and cycle power. Set the 485/OPE selector S7 to 485 (p.4-78). No built-in termination resistor.
- 32-bit values have the (MSB) number first and the (LSB) number next, i.e. high word first (ABCD). The FC10 example (p.4-89) also writes 0004h to 1014h and 93E0h to 1015h.
Registers (42)
«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.
42
Swipe the table sideways — the first column (manual address) stays put.
| Manual | Wire | Table | Name | Type | Unit · scale | R/W | FC | Details |
|---|---|---|---|---|---|---|---|---|
| 0001h | 0 (0x0000) | CO | RUN command | BIT | R/W | 01·05·0F | 1 = run, 0 = stop. Valid when A002 = 03 p.4-91, p.4-86 | |
| 0002h | 1 (0x0001) | CO | Rotation direction command | BIT | R/W | 01·05·0F | 1 = reverse, 0 = forward. Valid when A002 = 03 p.4-91 | |
| 0003h | 2 (0x0002) | CO | External trip (EXT) | BIT | R/W | 01·05·0F | 1 = trip p.4-91 | |
| 0004h | 3 (0x0003) | CO | Trip reset (RS) | BIT | R/W | 01·05·0F | 1 = reset p.4-91 | |
| 0007h | 6 (0x0006) | CO | Multi-function input 1 | BIT | R/W | 01·05·0F | 1 = ON. The control terminal block has priority. Inputs 2-5 are coils 0008h-000Bh p.4-91, p.4-83 | |
| 000Eh | 13 (0x000D) | CO | Operation status | BIT | R | 01 | 1 = run, 0 = stop (interlocked with d003) p.4-91 | |
| 000Fh | 14 (0x000E) | CO | Rotation direction | BIT | R | 01 | 1 = reverse, 0 = forward (interlocked with d003) p.4-91 | |
| 0010h | 15 (0x000F) | CO | Inverter ready | BIT | R | 01 | 1 = ready, 0 = not ready p.4-91 | |
| 0014h | 19 (0x0013) | CO | Alarm signal | BIT | R | 01 | 1 = during trip, 0 = normal p.4-91 | |
| 0016h | 21 (0x0015) | CO | Overload warning signal | BIT | R | 01 | p.4-92 | |
| 0017h | 22 (0x0016) | CO | Frequency arrival signal (over set frequency) | BIT | R | 01 | p.4-92 | |
| 0018h | 23 (0x0017) | CO | Frequency arrival signal (at a constant speed) | BIT | R | 01 | p.4-92 | |
| 0019h | 24 (0x0018) | CO | Signal during RUN | BIT | R | 01 | p.4-92 | |
| 001Ah | 25 (0x0019) | CO | Data writing | BIT | R | 01 | 1 = writing (use to watch the Enter command), 0 = normal p.4-92, p.4-90 | |
| 0002h | 1 (0x0001) | HR | Frequency reference | U16 | ×0.1 Hz | R/W | 03·06·10 | Valid when A001 = 03 Range 0 ~ 400 Hz p.4-92 |
| 0003h | 2 (0x0002) | HR | Inverter status | U16 | R | 03 | 0 = Default · 2 = Stop · 3 = Run · 4 = Free-run stop (FRS) · 5 = Jogging · 6 = DC injection braking · 7 = Retry · 8 = Trip · 9 = Undervoltage p.4-92 | |
| 0005h | 4 (0x0004) | HR | PID feedback | U16 | ×0.1 % | R/W | 03·06·10 | Valid when A076 = 02 Range 0 ~ 100 % p.4-92 |
| 0011h | 16 (0x0010) | HR | Fault frequency monitor (d080) | U16 | R | 03 | 0-65535 times p.4-93 | |
| 0012h | 17 (0x0011) | HR | Trip monitor 1: factor code (d081) | U16 | R | 03 | Latest trip. The read example (pp.4-84 to 4-85) returns 0003h = E03 (overcurrent). Trips 2 and 3 follow the same layout from 001Ch and 0026h p.4-93, p.4-84 | |
| 0014h | 19 (0x0013) | HR | Trip monitor 1: frequency | U16 | ×0.1 Hz | R | 03 | Read example response 0063h = 9.9 Hz p.4-93, p.4-85 |
| 0016h | 21 (0x0015) | HR | Trip monitor 1: current | U16 | ×0.1 A | R | 03 | Read example response 001Eh = 3.0 A p.4-93, p.4-85 |
| 0017h | 22 (0x0016) | HR | Trip monitor 1: voltage | U16 | V | R | 03 | DC (P-N) voltage at tripping. Read example response 011Ch = 284 V p.4-93, p.4-85 |
| 0018h | 23 (0x0017) | HR | Trip monitor 1: run time | U32 ABCD | h | R | 03 | 0018h high (MSB), 0019h low (LSB) p.4-93 |
| 0900h | 2303 (0x08FF) | HR | Enter command | U16 | W | 06 | Write any value with 06h. Values written by communication stay in RAM and are lost at power off. Watch coil 001Ah for progress. EEPROM life about 100,000 writes p.4-104, p.4-90 | |
| 1002h | 4097 (0x1001) | HR | Output frequency monitor (d001) | U16 | ×0.1 Hz | R | 03 | Range 0 ~ 400 Hz p.4-92 |
| 1004h | 4099 (0x1003) | HR | Rotation direction monitor (d003) | U16 | R | 03 | 0 = Stop · 1 = Forward · 2 = Reverse p.4-92 | |
| 1007h | 4102 (0x1006) | HR | Multi-function input monitor (d005) | U16 | R | 03 | b0 Terminal 1 · b1 Terminal 2 · b2 Terminal 3 · b3 Terminal 4 · b4 Terminal 5 p.4-93 | |
| 1008h | 4103 (0x1007) | HR | Multi-function output monitor (d006) | U16 | R | 03 | b0 P1 · b2 MA p.4-93 | |
| 100Eh | 4109 (0x100D) | HR | Total RUN time (d016) | U32 ABCD | h | R | 03 | 100Eh high (MSB), 100Fh low (LSB) Range 0 ~ 999999 h p.4-93 |
| 1010h | 4111 (0x100F) | HR | Power ON time monitor (d017) | U32 ABCD | h | R | 03 | 1010h high (MSB), 1011h low (LSB) Range 0 ~ 999999 h p.4-93 |
| 116Ah | 4457 (0x1169) | HR | Fin temperature monitor (d018) | U16 | ×0.1 °C | R | 03 | Range 0 ~ 200 °C p.4-93 |
| 116Ch | 4459 (0x116B) | HR | DC voltage monitor (d102) | U16 | ×0.1 V | R | 03 | Range 0 ~ 999.9 V p.4-93 |
| 116Dh | 4460 (0x116C) | HR | Electronic thermal monitor (d104) | U16 | ×0.1 % | R | 03 | Overload trip (E05) at 100% Range 0 ~ 100 % p.4-93 |
| 1014h | 4115 (0x1013) | HR | Acceleration time 1 (F002) | U32 ABCD | ×0.01 s | R/W | 03·10 | 1014h high (MSB), 1015h low (LSB). The FC10 example (pp.4-88 to 4-89) writes 300000 (3000.00 s) with 08 10 10 13 00 02 04 00 04 93 E0 7D 53. Above 100.0 s the second decimal place is ignored Range 0.01 ~ 3000 s p.4-94, p.4-88 |
| 1016h | 4117 (0x1015) | HR | Deceleration time 1 (F003) | U32 ABCD | ×0.01 s | R/W | 03·10 | 1016h high (MSB), 1017h low (LSB) Range 0.01 ~ 3000 s p.4-94 |
| 1019h | 4120 (0x1018) | HR | Frequency reference selection (A001) | U16 | R/W | 03·06·10 | Default 00 0 = Digital Operator (volume) · 1 = Terminal · 2 = Digital Operator (F001) · 3 = ModBus communication · 10 = Frequency operation result p.4-94, p.4-79 | |
| 101Ah | 4121 (0x1019) | HR | RUN command selection (A002) | U16 | R/W | 03·06·10 | Default 02 1 = Terminal · 2 = Digital Operator · 3 = ModBus communication p.4-94, p.4-79 | |
| 101Bh | 4122 (0x101A) | HR | Base frequency (A003) | U16 | Hz | R/W | 03·06·10 | 30 to maximum frequency (A004) p.4-94 |
| 101Ch | 4123 (0x101B) | HR | Maximum frequency (A004) | U16 | Hz | R/W | 03·06·10 | Range 30 ~ 400 Hz p.4-94 |
| 1029h | 4136 (0x1028) | HR | Multi-step speed reference 0 (A020) | U16 | ×0.1 Hz | R/W | 03·06·10 | 0.0 or starting frequency to 400.0. The FC06 example (pp.4-86 to 4-87) writes 500 (50.0 Hz) with 08 06 10 28 01 F4 0D 8C. Multi-step speeds 1-15 start at 102Bh, every 2 registers Range 0 ~ 400 Hz p.4-95, p.4-86 |
| 105Ah | 4185 (0x1059) | HR | Frequency upper limit (A061) | U16 | ×0.1 Hz | R/W | 03·06·10 | 0.0 or lower limit (A062) to maximum frequency (A004) p.4-96 |
| 105Bh | 4186 (0x105A) | HR | Frequency lower limit (A062) | U16 | ×0.1 Hz | R/W | 03·06·10 | 0.0 or starting frequency (b082) to upper limit (A061) p.4-96 |
Notes
- Page numbers are printed pages (in chapter 4, PDF page = xxx of 4-xxx + 85, e.g. p.4-92 = PDF 177).
- To run and set frequency by communication set A002 = 03 and A001 = 03 (pp.4-79, 4-86).
- Output current (d002, 1003h) and output voltage (d013, 100Ch) are not included: the communication table (pp.4-92 to 4-93) gives 0.1 % and 0.01 % units, while the monitor list in the same manual gives A and V.
- Trip factor (0012h) codes have no table in the communication section, so values are left empty; the example (p.4-85) reads 0003h as E03. Communication settings C070-C078 (1137h-113Fh) are marked «Do not change through ModBus» and are not included (p.4-104).
- Values written by communication are in RAM only. To keep them write any value to 0900h (Enter command, p.4-90).
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
- omron/3g3jx.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
- OMRON SYSDRIVE JX Series Compact Simplified Inverters User's Manual (Cat. No. I558-E1-02) — OMRON Corporation, Cat. No. I558-E1-02 (revision 02 = April 2008) · 4-2 Communication function printed pp.4-77 to 4-104 (PDF 162-189) · checked 2026-10-29