esp-idf: MODBUS Serial example not working (IDFGH-5822)

Hi newbie here, working with esp-idf 4.2.2

I am working on MODBUS Serial example of esp-idf,I simply just connected the hardware as shown in the example.

ESP32-1(Master) and ESP32-2(Slave) by using two TTL to RS485 converters.

But I am not able to get the expected output. I am gettinfg the 0x108 Err that is invalid slave response.

Master output: E (65579) MB_CONTROLLER_MASTER: mbc_master_get_parameter(111): SERIAL master get parameter failure error=(0x108) (ESP_ERR_INVALID_RESPONSE). E (65579) MASTER_TEST: Characteristic #0 (Data_channel_0) read fail, err = 0x108 (ESP_ERR_INVALID_RESPONSE). E (65599) MB_CONTROLLER_MASTER: mbc_master_get_parameter(111): SERIAL master get parameter failure error=(0x108) (ESP_ERR_INVALID_RESPONSE). E (65609) MASTER_TEST: Characteristic #1 (Humidity_1) read fail, err = 0x108 (ESP_ERR_INVALID_RESPONSE). E (65619) MB_CONTROLLER_MASTER: mbc_master_get_parameter(111): SERIAL master get parameter failure error=(0x108) (ESP_ERR_INVALID_RESPONSE). E (65629) MASTER_TEST: Characteristic #2 (Temperature_1) read fail, err = 0x108 (ESP_ERR_INVALID_RESPONSE). E (65649) MB_CONTROLLER_MASTER: mbc_master_get_parameter(111): SERIAL master get parameter failure error=(0x108) (ESP_ERR_INVALID_RESPONSE). E (65649) MASTER_TEST: Characteristic #3 (Humidity_2) read fail, err = 0x108 (ESP_ERR_INVALID_RESPONSE). E (65669) MB_CONTROLLER_MASTER: mbc_master_get_parameter(111): SERIAL master get parameter failure error=(0x108) (ESP_ERR_INVALID_RESPONSE). E (65679) MASTER_TEST: Characteristic #4 (Temperature_2) read fail, err = 0x108 (ESP_ERR_INVALID_RESPONSE). E (65699) MB_CONTROLLER_MASTER: mbc_master_get_parameter(111): SERIAL master get parameter failure error=(0x108) (ESP_ERR_INVALID_RESPONSE). E (65699) MASTER_TEST: Characteristic #5 (Humidity_3) read fail, err = 0x108 (ESP_ERR_INVALID_RESPONSE). E (65719) MB_CONTROLLER_MASTER: mbc_master_get_parameter(111): SERIAL master get parameter failure error=(0x108) (ESP_ERR_INVALID_RESPONSE). E (65729) MASTER_TEST: Characteristic #6 (Test_regs) read fail, err = 0x108 (ESP_ERR_INVALID_RESPONSE). I (65739) MASTER_TEST: Characteristic #7 RelayP1 (on/off) value = OFF (0x55) read successful. I (65749) MASTER_TEST: Characteristic #8 RelayP2 (on/off) value = OFF (0xaa) read successful. E (67749) MASTER_TEST: Alarm is not triggered after 30 retries. I (67749) MASTER_TEST: Destroy master...

Slave Response: I (97984) SLAVE_TEST: COILS READ (97681730 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (97994) SLAVE_TEST: COILS READ (97690818 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (100154) SLAVE_TEST: COILS READ (99851729 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (100164) SLAVE_TEST: COILS READ (99860956 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (102324) SLAVE_TEST: COILS READ (102021659 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (102334) SLAVE_TEST: COILS READ (102030886 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (104494) SLAVE_TEST: COILS READ (104191526 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (104504) SLAVE_TEST: COILS READ (104200746 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (106664) SLAVE_TEST: COILS READ (106361451 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (106674) SLAVE_TEST: COILS READ (106370676 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (108834) SLAVE_TEST: COILS READ (108532558 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (108844) SLAVE_TEST: COILS READ (108541925 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (111004) SLAVE_TEST: COILS READ (110702488 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (111014) SLAVE_TEST: COILS READ (110711785 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (113174) SLAVE_TEST: COILS READ (112872418 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (113184) SLAVE_TEST: COILS READ (112881716 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (115344) SLAVE_TEST: COILS READ (115042417 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (115354) SLAVE_TEST: COILS READ (115051715 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (117514) SLAVE_TEST: COILS READ (117212208 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (117524) SLAVE_TEST: COILS READ (117221581 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (119684) SLAVE_TEST: COILS READ (119382138 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (119694) SLAVE_TEST: COILS READ (119391435 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (121854) SLAVE_TEST: COILS READ (121552068 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (121864) SLAVE_TEST: COILS READ (121561365 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (124024) SLAVE_TEST: COILS READ (123722067 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (124034) SLAVE_TEST: COILS READ (123731364 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (126194) SLAVE_TEST: COILS READ (125891858 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (126204) SLAVE_TEST: COILS READ (125901224 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (128364) SLAVE_TEST: COILS READ (128061788 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (128374) SLAVE_TEST: COILS READ (128071085 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (130534) SLAVE_TEST: COILS READ (130231718 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (130544) SLAVE_TEST: COILS READ (130241014 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (132704) SLAVE_TEST: COILS READ (132401717 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (132714) SLAVE_TEST: COILS READ (132411014 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (134874) SLAVE_TEST: COILS READ (134571511 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (134884) SLAVE_TEST: COILS READ (134580874 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (137044) SLAVE_TEST: COILS READ (136741438 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (137054) SLAVE_TEST: COILS READ (136750734 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (139214) SLAVE_TEST: COILS READ (138911367 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (139224) SLAVE_TEST: COILS READ (138920664 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (141384) SLAVE_TEST: COILS READ (141081367 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (141394) SLAVE_TEST: COILS READ (141090663 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (143554) SLAVE_TEST: COILS READ (143251158 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (143564) SLAVE_TEST: COILS READ (143260524 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (145724) SLAVE_TEST: COILS READ (145421087 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (145734) SLAVE_TEST: COILS READ (145430384 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (147894) SLAVE_TEST: COILS READ (147591017 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (147904) SLAVE_TEST: COILS READ (147600314 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (150064) SLAVE_TEST: COILS READ (149761016 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (150074) SLAVE_TEST: COILS READ (149770313 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (152234) SLAVE_TEST: COILS READ (151930807 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (152244) SLAVE_TEST: COILS READ (151940174 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (154404) SLAVE_TEST: COILS READ (154100737 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (154414) SLAVE_TEST: COILS READ (154110034 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (156574) SLAVE_TEST: COILS READ (156270667 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (156584) SLAVE_TEST: COILS READ (156279964 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (158744) SLAVE_TEST: COILS READ (158440666 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (158754) SLAVE_TEST: COILS READ (158449963 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (160914) SLAVE_TEST: COILS READ (160610527 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (160924) SLAVE_TEST: COILS READ (160619893 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 I (163084) SLAVE_TEST: COILS READ (162780387 us), ADDR:0, TYPE:32, INST_ADDR:0x3ffb26a4, SIZE:8 I (163094) SLAVE_TEST: COILS READ (162789685 us), ADDR:8, TYPE:32, INST_ADDR:0x3ffb26a5, SIZE:8 ![processed](https://user-images.githubusercontent.com/46959108/132165759-24327fb1-46d1-4ec9-89d4-218db4b1ed43.jpeg)

Please help to solve this issue.

Thank you in advance.

About this issue

  • Original URL
  • State: closed
  • Created 3 years ago
  • Comments: 103

Most upvoted comments

@HEMILSHAH007 , Ah, sorry the order of CIDS is not contiguous. It is a mistake from my side (copy, paste) and is not accepted on v4.2. Please fix as below:


enum {
    CID_V_1ST_PHASE = 0,
    CID_V_2ND_PHASE,
    CID_V_3RD_PHASE,
    CID_V_AVERAGE_LN,
    CID_V12,
    CID_V23,
    CID_V31,
    CID_V_AVERAGE_LL,
    CID_CURRENT_I1,
    CID_CURRENT_I2,
    CID_CURRENT_I3,
    CID_CURRENT_AVERAGE,
    CID_KW1,
    CID_KW2,
    CID_KW3,
    CID_HOLD_TEST_REG,
    CID_COUNT
};

const mb_parameter_descriptor_t device_parameters[] = {
    // { CID, Param Name, Units, Modbus Slave Addr, Modbus Reg Type, Reg Start, Reg Size, Instance Offset, Data Type, Data Size, Parameter Options, Access Mode}
    { CID_V_1ST_PHASE, STR("Voltage first phase"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 0, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_V_2ND_PHASE, STR("Voltage second phase"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 2, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_V_3RD_PHASE, STR("Voltage third phase"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 4, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_V_AVERAGE_LN, STR("Average voltage LN"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 6, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_V12, STR("Voltage_V12"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 8, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_V23, STR("Voltage_V23"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 10, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_V31, STR("Voltage_V31"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 12, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_V_AVERAGE_LL, STR("Voltage_AVERAGE_LL"), STR("Volts"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 14, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_CURRENT_I1, STR("Current_I1"), STR("A"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 16, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER },
    { CID_CURRENT_I2, STR("Current_I2"), STR("A"), MB_DEVICE_ADDR1, MB_PARAM_INPUT, 18, 2,
            0, PARAM_TYPE_U32, 4, OPTS(0, 65535, 1 ), PAR_PERMS_READ_WRITE_TRIGGER }
};
+1
alisitsyn on Feb 16, 2022

Ok, thank you for your help

+1
rjrajbir on Oct 25, 2021

Hi,

The ModbusSlave wrapper update here.

+1
alisitsyn on Oct 19, 2021

Thank you so much for your help, I will try to do this, but I am also waiting from your version of code

+1
rjrajbir on Oct 6, 2021

Hi,

Please help me solve this.

Please use the modified master code to check it under CPP: modbus_simple_master.zip

I would be great if you could make a simple c++ template for modbus, so that i can use it complete the wrapper.

The data dictionary is not required for the wrapper because the function mbc_master_send_request() does not use it. I will send you the wrapper according to my plans. Updated: ModbusMaster CPP wrapper example

+1
alisitsyn on Sep 22, 2021
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