CYD Pendant Not Connecting

maxrasso · May 28, 2026, 7:24pm

Dear Community,

I “inherited” a working LowRider as a form of uni project. I was able to figure out most problems by browsing the forums, but I am kinda at a dead end with the CYD.

The CYD powers up fine and the wheel does function to scroll through the menu. By the title you most likely can already guess that it does not connect to the Jackpot3 tho. I added the usual bits to the config, switched txd_pin and rxd_pin around in SW and HW - but no luck.

I tried the combination of Pins 13 & 14 first and then I switched to 12 & 15, which made no difference.

uart2:
txd_pin: gpio.15
rxd_pin: gpio.12
rts_pin: NO_PIN
cts_pin: NO_PIN
baud: 1000000
mode: 8N1

uart_channel2:
report_interval_ms: 75
uart_num: 2

I tried to ditch the RJ12 Cable an hooked up the CYD via breadboard and jumper wires but also no luck. Display powers on as always, but no connection

I don’t get any error messages when starting up:

$G
[GC:G0 G54 G17 G21 G90 G94 M5 M9 T0 F0 S0]
ok
$SS
<Idle|MPos:0.000,0.000,0.000|FS:0,0|WCO:403.800,265.100,13.445>
[MSG:INFO: FluidNC v3.9.4 https://github.com/bdring/FluidNC]
[MSG:INFO: Compiled with ESP32 SDK:v4.4.7-dirty]
[MSG:INFO: Local filesystem type is littlefs]
[MSG:INFO: Configuration file:config.yaml]
[MSG:INFO: Machine LowRider]
[MSG:INFO: Board Jackpot TMC2209]
[MSG:INFO: UART1 Tx:gpio.0 Rx:gpio.4 RTS:NO_PIN Baud:115200]
[MSG:INFO: UART2 Tx:gpio.15 Rx:gpio.12 RTS:NO_PIN Baud:1000000]
[MSG:INFO: uart_channel2 created at report interval: 75]
[MSG:INFO: I2SO BCK:gpio.22 WS:gpio.17 DATA:gpio.21Min Pulse:2us]
[MSG:INFO: SPI SCK:gpio.18 MOSI:gpio.23 MISO:gpio.19]
[MSG:INFO: SD Card cs_pin:gpio.5 detect:NO_PIN freq:20000000]
[MSG:INFO: Stepping:I2S_STATIC Pulse:2us Dsbl Delay:0us Dir Delay:1us Idle Delay:255ms]
[MSG:INFO: User Digital Output: 0 on Pin:gpio.26]
[MSG:INFO: User Digital Output: 1 on Pin:gpio.27]
[MSG:INFO: Axis count 3]
[MSG:INFO: Axis X (0.000,800.000)]
[MSG:INFO:   Motor0]
[MSG:INFO:     tmc_2209 UART1 Addr:0 CS:NO_PIN Step:I2SO.2 Dir:I2SO.1 Disable:I2SO.0 R:0.110]
[MSG:INFO:  X Neg Limit gpio.25]
[MSG:INFO: Axis Y (0.000,1600.000)]
[MSG:INFO:   Motor0]
[MSG:INFO:     tmc_2209 UART1 Addr:1 CS:NO_PIN Step:I2SO.5 Dir:I2SO.4 Disable:I2SO.7 R:0.110]
[MSG:INFO:  Y Neg Limit gpio.33]
[MSG:INFO:   Motor1]
[MSG:INFO:     tmc_2209 UART1 Addr:3 CS:I2SO.14 Step:I2SO.13 Dir:I2SO.12 Disable:I2SO.15 R:0.110]
[MSG:INFO:  Y2 Neg Limit gpio.35]
[MSG:INFO: Axis Z (0.000,100.000)]
[MSG:INFO:   Motor0]
[MSG:INFO:     tmc_2209 UART1 Addr:2 CS:NO_PIN Step:I2SO.10 Dir:I2SO.9 Disable:I2SO.8 R:0.110]
[MSG:INFO:  Z Pos Limit gpio.32]
[MSG:INFO:   Motor1]
[MSG:INFO:     tmc_2209 UART1 Addr:3 CS:I2SO.19 Step:I2SO.18 Dir:I2SO.17 Disable:I2SO.16 R:0.110]
[MSG:INFO:  Z2 Pos Limit gpio.34]
[MSG:INFO: X Axis driver test passed]
[MSG:INFO: Y Axis driver test passed]
[MSG:INFO: Y2 Axis driver test passed]
[MSG:INFO: Z Axis driver test passed]
[MSG:INFO: Z2 Axis driver test passed]
[MSG:INFO: Kinematic system: Cartesian]
[MSG:INFO: AP SSID FluidNC IP 192.168.0.1 mask 255.255.255.0 channel 1]
[MSG:INFO: AP started]
[MSG:INFO: WiFi on]
[MSG:INFO: Captive Portal Started]
[MSG:INFO: HTTP started on port 80]
[MSG:INFO: Telnet started on port 23]
[MSG:INFO: Flood coolant gpio.2]
[MSG:INFO: Mist coolant gpio.16]
[MSG:INFO: Probe gpio.36:low]
ok
<Idle|MPos:0.000,0.000,0.000|FS:0,0|Ov:100,100,100>

I did the speed control externally with an Arduino - the guys working previously on the machine tried to get the spindle module to work, which uses the same pins. Could there be some old attachments that block the CYD from working? Of course I tried to deleted the respectable lines already in the config - but maybe I missed something…

board: Jackpot TMC2209
name: LowRider
meta: SS26_MR

planner_blocks: 32

stepping:
  engine: I2S_STATIC
  idle_ms: 255
  pulse_us: 2
  dir_delay_us: 1
  disable_delay_us: 0
  segments: 12

uart1:
  txd_pin: gpio.0
  rxd_pin: gpio.4
  rts_pin: NO_PIN
  baud: 115200
  mode: 8N1
i2so:
  bck_pin: gpio.22
  data_pin: gpio.21
  ws_pin: gpio.17
spi:
  miso_pin: gpio.19
  mosi_pin: gpio.23
  sck_pin: gpio.18
sdcard:
  cs_pin: gpio.5
  card_detect_pin: NO_PIN
  frequency_hz: 20000000
kinematics: {}
axes:
  shared_stepper_disable_pin: NO_PIN
  shared_stepper_reset_pin: NO_PIN
  homing_runs: 2
  x:
    steps_per_mm: 50
    max_rate_mm_per_min: 15000
    acceleration_mm_per_sec2: 200
    max_travel_mm: 800
    soft_limits: true
    homing:
      cycle: 2
      allow_single_axis: true
      positive_direction: false
      mpos_mm: 0
      feed_mm_per_min: 300
      seek_mm_per_min: 2000
      settle_ms: 500
      seek_scaler: 1.1
      feed_scaler: 1.1
    motor0:
      limit_neg_pin: gpio.25
      limit_pos_pin: NO_PIN
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 3
      tmc_2209:
        addr: 0
        cs_pin: NO_PIN
        uart_num: 1
        step_pin: i2so.2
        direction_pin: i2so.1
        disable_pin: I2SO.0
        r_sense_ohms: 0.11
        run_amps: 0.8
        hold_amps: 0.5
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        homing_amps: 0.8
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3
  y:
    steps_per_mm: 50
    max_rate_mm_per_min: 5000
    acceleration_mm_per_sec2: 200
    max_travel_mm: 1600
    soft_limits: true
    homing:
      cycle: 2
      allow_single_axis: true
      positive_direction: false
      mpos_mm: 0
      feed_mm_per_min: 300
      seek_mm_per_min: 1500
      settle_ms: 500
      seek_scaler: 1.1
      feed_scaler: 1.1
    motor0:
      limit_neg_pin: gpio.33
      limit_pos_pin: NO_PIN
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 3
      tmc_2209:
        addr: 1
        cs_pin: NO_PIN
        uart_num: 1
        step_pin: i2so.5
        direction_pin: i2so.4
        disable_pin: I2SO.7
        r_sense_ohms: 0.11
        run_amps: 0.8
        hold_amps: 0.5
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        homing_amps: 0.8
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3
    motor1:
      limit_neg_pin: gpio.35
      limit_pos_pin: NO_PIN
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 3
      tmc_2209:
        addr: 3
        cs_pin: I2SO.14
        uart_num: 1
        step_pin: i2so.13
        direction_pin: i2so.12
        disable_pin: I2SO.15
        r_sense_ohms: 0.11
        run_amps: 0.8
        hold_amps: 0.5
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        homing_amps: 0.8
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3
  z:
    steps_per_mm: 200
    max_rate_mm_per_min: 300
    acceleration_mm_per_sec2: 50
    max_travel_mm: 100
    soft_limits: true
    homing:
      cycle: 1
      allow_single_axis: true
      positive_direction: true
      mpos_mm: 100
      feed_mm_per_min: 300
      seek_mm_per_min: 800
      settle_ms: 500
      seek_scaler: 1.1
      feed_scaler: 1.1
    motor0:
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.32
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 3
      tmc_2209:
        addr: 2
        cs_pin: NO_PIN
        uart_num: 1
        step_pin: i2so.10
        direction_pin: i2so.9
        disable_pin: I2SO.8
        r_sense_ohms: 0.11
        run_amps: 0.8
        hold_amps: 0.5
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        homing_amps: 0.8
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3
    motor1:
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.34
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 3
      tmc_2209:
        addr: 3
        cs_pin: I2SO.19
        uart_num: 1
        step_pin: i2so.18
        direction_pin: i2so.17
        disable_pin: I2SO.16
        r_sense_ohms: 0.11
        run_amps: 0.8
        hold_amps: 0.5
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: StealthChop
        homing_mode: StealthChop
        homing_amps: 0.8
        stallguard: 0
        stallguard_debug: false
        toff_coolstep: 3
control:
  safety_door_pin: NO_PIN
  reset_pin: NO_PIN
  feed_hold_pin: NO_PIN
  cycle_start_pin: NO_PIN
  macro0_pin: NO_PIN
  macro1_pin: NO_PIN
  macro2_pin: NO_PIN
  macro3_pin: NO_PIN
  fault_pin: NO_PIN
  estop_pin: NO_PIN
coolant:
  flood_pin: gpio.2
  mist_pin: gpio.16
  delay_ms: 0
probe:
  pin: gpio.36:low
  toolsetter_pin: NO_PIN
  check_mode_start: false
  hard_stop: false
macros: {}
start:
  must_home: false
  deactivate_parking: false
  check_limits: true
parking:
  enable: false
  axis: Z
  target_mpos_mm: -5
  rate_mm_per_min: 800
  pullout_distance_mm: 5
  pullout_rate_mm_per_min: 250

user_outputs:
  analog0_pin: NO_PIN
  analog1_pin: NO_PIN
  analog2_pin: NO_PIN
  analog3_pin: NO_PIN
  analog0_hz: 5000
  analog1_hz: 5000
  analog2_hz: 5000
  analog3_hz: 5000
  digital0_pin: gpio.26
  digital1_pin: gpio.27
  digital2_pin: NO_PIN
  digital3_pin: NO_PIN
  digital4_pin: NO_PIN
  digital5_pin: NO_PIN
  digital6_pin: NO_PIN
  digital7_pin: NO_PIN

user_inputs:
  analog0_pin: NO_PIN
  analog1_pin: NO_PIN
  analog2_pin: NO_PIN
  analog3_pin: NO_PIN
  digital0_pin: NO_PIN
  digital1_pin: NO_PIN
  digital2_pin: NO_PIN
  digital3_pin: NO_PIN
  digital4_pin: NO_PIN
  digital5_pin: NO_PIN
  digital6_pin: NO_PIN
  digital7_pin: NO_PIN

#Pendant

uart2:
 txd_pin: gpio.15
 rxd_pin: gpio.12
 rts_pin: NO_PIN
 cts_pin: NO_PIN
 baud: 1000000
 mode: 8N1

uart_channel2:
 report_interval_ms: 75
 uart_num: 2

I know not everyone is a fan of the CYD, but I hope you guys can help me get it going! Thanks in advance for every reply

Britt · May 28, 2026, 8:25pm

Welcome aboard Max. You have a Jackpot 1. I would update Fluidnc to at least 3.9.9. Then change the config.

The config settings for it are:

uart2:
  txd_pin: gpio.14
  rxd_pin: gpio.13
  rts_pin: NO_PIN
  cts_pin: NO_PIN
  baud: 1000000
  mode: 8N1


uart_channel2:
  uart_num: 2
  report_interval_ms: 75

After you make the changes power down and unplug the USB cable if you have one. The power back up and it should recognize the CYD.

maxrasso · June 1, 2026, 9:03am

Hi Britt! Ty for your response ! I figured the firmware would be outdated… will try it this afternoon when I finally have access to the cnc again

maxrasso · June 1, 2026, 4:49pm

Sadly that did not do it for me. V3.9.9 is up and running. I again tried changing the gpio pins to 12 and 15 but no change. I degraded the CYD to an older firmware v1.2 instead of v1.3 but sadly also nothing

edit: I also switched the communication pins on the cyd and rebooted it several times

martinrogan · June 1, 2026, 10:56pm

you have to use pins 13 & 14 on that jackpot. if they don’t work in one order, swap them in the config.yaml and load new file. triple check the tx/rx have actually been swapped.

maxrasso · June 2, 2026, 5:14am

Yes I did that. Used the pins 13/14 switched them in the config - upload - power off - nothing - again power off - switched the wires - reboot & still N/C on the CYD

ttraband · June 2, 2026, 2:12pm

Are you sure you unplugged the USB cable from the ESP32 after updating the firmware? If that’s running before the rest of the jackpot board is powered up, lots of stuff doesn’t load properly.

maxrasso · June 2, 2026, 5:23pm

Yes of course. I did unplug it from its power supply, then plugged it into the laptop, did the firmware upgrade, unplugged it from usb to power it down and then I plugged the power supply back in

maxrasso · June 2, 2026, 5:32pm

Is tx rx on the esp linked to gpio13/14 on the jackpot? I did something unorthodox to rule out that the mates before me blew the esp/jackpot.

That also didnt work

maxrasso · June 8, 2026, 12:55pm

I ended up using the wifi connection. Still would prefer wired, if anyone has some input for me

Thank you !