7i76EU+7i85+7i84U

Todd Zuercher
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24 Feb 2026 16:02 #343405 by Todd Zuercher

7i76EU+7i85+7i84U was created by Todd Zuercher

First time using a Mesa Ethernet board and I'm trying to set up a new install. I think I've flashed the right firmware to the 7i76eu. But I can't seem to see the 7i84u card that I have plugged into the first serial connector on the 7i85. The encoders seem to be working on the 7i85, but I can't seem to make the 7i84u work. On the 7i85u CR2 and CR7 are on yellow and CR5 is on red. Not sure what I'm doing/have done wrong.

Here's the output of mesaflash --device 7i76eu --addr 10.10.10.10 --readhmid

twincnc@twincnc:~$ mesaflash --device 7i76eu  --addr 10.10.10.10  --readhmid
Configuration Name: HOSTMOT2

General configuration information:

  BoardName : MESA7I76
  FPGA Size: 20 KGates
  FPGA Pins: 256
  Number of IO Ports: 3
  Width of one I/O port: 17
  Clock Low frequency: 100.0000 MHz
  Clock High frequency: 160.0000 MHz
  IDROM Type: 3
  Instance Stride 0: 4
  Instance Stride 1: 64
  Register Stride 0: 256
  Register Stride 1: 256

Modules in configuration:

  Module: DPLL
  There are 1 of DPLL in configuration
  Version: 0
  Registers: 7
  BaseAddress: 7000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: WatchDog
  There are 1 of WatchDog in configuration
  Version: 0
  Registers: 3
  BaseAddress: 0C00
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: IOPort
  There are 3 of IOPort in configuration
  Version: 0
  Registers: 5
  BaseAddress: 1000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: StepGen
  There are 5 of StepGen in configuration
  Version: 2
  Registers: 10
  BaseAddress: 2000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: MuxedQCount
  There are 6 of MuxedQCount in configuration
  Version: 4
  Registers: 5
  BaseAddress: 3600
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: MuxedQCountSel
  There are 1 of MuxedQCountSel in configuration
  Version: 0
  Registers: 0
  BaseAddress: 0000
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

  Module: SSerial
  There are 1 of SSerial in configuration
  Version: 0
  Registers: 6
  BaseAddress: 5B00
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 64 bytes

  Module: LED
  There are 1 of LED in configuration
  Version: 0
  Registers: 1
  BaseAddress: 0200
  ClockFrequency: 100.000 MHz
  Register Stride: 256 bytes
  Instance Stride: 4 bytes

Configuration pin-out:

IO Connections for on-card -> 7I76
Pin#                  I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir

TB2-4,5                 0   IOPort       StepGen          0        Dir/Table2      (Out)
TB2-2,3                 1   IOPort       StepGen          0        Step/Table1     (Out)
TB2-10,11               2   IOPort       StepGen          1        Dir/Table2      (Out)
TB2-8,9                 3   IOPort       StepGen          1        Step/Table1     (Out)
TB2-16,17               4   IOPort       StepGen          2        Dir/Table2      (Out)
TB2-14,15               5   IOPort       StepGen          2        Step/Table1     (Out)
TB2-22,23               6   IOPort       StepGen          3        Dir/Table2      (Out)
TB2-20,21               7   IOPort       StepGen          3        Step/Table1     (Out)
TB3-4,5                 8   IOPort       StepGen          4        Dir/Table2      (Out)
TB3-2,3                 9   IOPort       StepGen          4        Step/Table1     (Out)
Internal-Field-IO      10   IOPort       SSerial          0        TXData0         (Out)
Internal-Field-IO      11   IOPort       SSerial          0        RXData0         (In)
TB3-18,19              12   IOPort       SSerial          0        TXData1         (Out)
TB3-16,17              13   IOPort       SSerial          0        RXData1         (In)
TB3-13,14              14   IOPort       MuxedQCount      2        MuxQ-IDX        (In)
TB3-10,11              15   IOPort       MuxedQCount      2        MuxQ-B          (In)
TB3-7,8                16   IOPort       MuxedQCount      2        MuxQ-A          (In)

IO Connections for P1
DB25 pin#             I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir

 1                     17   IOPort       SSerial          0        RXData6         (In)
14                     18   IOPort       SSerial          0        TXData6         (Out)
 2                     19   IOPort       SSerial          0        RXData5         (In)
15                     20   IOPort       SSerial          0        TXData5         (Out)
 3                     21   IOPort       SSerial          0        RXData4         (In)
16                     22   IOPort       SSerial          0        TXData4         (Out)
 4                     23   IOPort       SSerial          0        RXData3         (In)
17                     24   IOPort       SSerial          0        TXData3         (Out)
 5                     25   IOPort       SSerial          0        RXData2         (In)
 6                     26   IOPort       SSerial          0        TXData2         (Out)
 7                     27   IOPort       MuxedQCountSel   0        MuxSel0         (Out)
 8                     28   IOPort       MuxedQCount      0        MuxQ-A          (In)
 9                     29   IOPort       MuxedQCount      0        MuxQ-B          (In)
10                     30   IOPort       MuxedQCount      0        MuxQ-IDX        (In)
11                     31   IOPort       MuxedQCount      1        MuxQ-A          (In)
12                     32   IOPort       MuxedQCount      1        MuxQ-B          (In)
13                     33   IOPort       MuxedQCount      1        MuxQ-IDX        (In)

IO Connections for P2
DB25 pin#             I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir

 1                     34   IOPort       None           
14                     35   IOPort       None           
 2                     36   IOPort       None           
15                     37   IOPort       None           
 3                     38   IOPort       None           
16                     39   IOPort       None           
 4                     40   IOPort       None           
17                     41   IOPort       None           
 5                     42   IOPort       None           
 6                     43   IOPort       None           
 7                     44   IOPort       None           
 8                     45   IOPort       None           
 9                     46   IOPort       None           
10                     47   IOPort       None           
11                     48   IOPort       None           
12                     49   IOPort       None           
13                     50   IOPort       None

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tommylight
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24 Feb 2026 16:09 #343407 by tommylight

Replied by tommylight on topic 7i76EU+7i85+7i84U

7i84 requires having field power on both section for all IO to show up, not sure about the 7i84U.
Is the field power applied to the 7i84U?

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PCW
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24 Feb 2026 16:11 - 24 Feb 2026 16:17 #343409 by PCW

Replied by PCW on topic 7i76EU+7i85+7i84U

Is sserial channel 2 enabled in the hal file?

(something like : "sserial_port_0=000xxxxx" in the driver command line)

Also

mesaflash --device 7i76eu --addr 10.10.10.10 --dbname2 7i85 --readhmid

would list the 7I85 pins, not DB25 pins

Last edit: 24 Feb 2026 16:17 by PCW.

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Todd Zuercher
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24 Feb 2026 16:26 #343412 by Todd Zuercher

Replied by Todd Zuercher on topic 7i76EU+7i85+7i84U

Yes, the field power is connected.

I have this for the config line in hal

loadrt hm2_eth board_ip="10.10.10.10" config="num_encoders=5 num_pwmgens=0 num_stepgens=5 sserial_port_0=0000000x"

Here's the output from mesaflash;

twincnc@twincnc:~$ mesaflash --device 7i76eu --addr 10.10.10.10 --dbname2 7i85 --readhmid
Configuration Name: HOSTMOT2

General configuration information:

BoardName : MESA7I76
FPGA Size: 20 KGates
FPGA Pins: 256
Number of IO Ports: 3
Width of one I/O port: 17
Clock Low frequency: 100.0000 MHz
Clock High frequency: 160.0000 MHz
IDROM Type: 3
Instance Stride 0: 4
Instance Stride 1: 64
Register Stride 0: 256
Register Stride 1: 256

Modules in configuration:

Module: DPLL
There are 1 of DPLL in configuration
Version: 0
Registers: 7
BaseAddress: 7000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: WatchDog
There are 1 of WatchDog in configuration
Version: 0
Registers: 3
BaseAddress: 0C00
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: IOPort
There are 3 of IOPort in configuration
Version: 0
Registers: 5
BaseAddress: 1000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: StepGen
There are 5 of StepGen in configuration
Version: 2
Registers: 10
BaseAddress: 2000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: MuxedQCount
There are 6 of MuxedQCount in configuration
Version: 4
Registers: 5
BaseAddress: 3600
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: MuxedQCountSel
There are 1 of MuxedQCountSel in configuration
Version: 0
Registers: 0
BaseAddress: 0000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: SSerial
There are 1 of SSerial in configuration
Version: 0
Registers: 6
BaseAddress: 5B00
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 64 bytes

Module: LED
There are 1 of LED in configuration
Version: 0
Registers: 1
BaseAddress: 0200
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Configuration pin-out:

IO Connections for on-card -> 7I76
Pin# I/O Pri. func Sec. func Chan Sec. Pin func Sec. Pin Dir

TB2-4,5 0 IOPort StepGen 0 Dir/Table2 (Out)
TB2-2,3 1 IOPort StepGen 0 Step/Table1 (Out)
TB2-10,11 2 IOPort StepGen 1 Dir/Table2 (Out)
TB2-8,9 3 IOPort StepGen 1 Step/Table1 (Out)
TB2-16,17 4 IOPort StepGen 2 Dir/Table2 (Out)
TB2-14,15 5 IOPort StepGen 2 Step/Table1 (Out)
TB2-22,23 6 IOPort StepGen 3 Dir/Table2 (Out)
TB2-20,21 7 IOPort StepGen 3 Step/Table1 (Out)
TB3-4,5 8 IOPort StepGen 4 Dir/Table2 (Out)
TB3-2,3 9 IOPort StepGen 4 Step/Table1 (Out)
Internal-Field-IO 10 IOPort SSerial 0 TXData0 (Out)
Internal-Field-IO 11 IOPort SSerial 0 RXData0 (In)
TB3-18,19 12 IOPort SSerial 0 TXData1 (Out)
TB3-16,17 13 IOPort SSerial 0 RXData1 (In)
TB3-13,14 14 IOPort MuxedQCount 2 MuxQ-IDX (In)
TB3-10,11 15 IOPort MuxedQCount 2 MuxQ-B (In)
TB3-7,8 16 IOPort MuxedQCount 2 MuxQ-A (In)

IO Connections for P1 -> 7I85
Pin# I/O Pri. func Sec. func Chan Sec. Pin func Sec. Pin Dir

TB1-19,20 17 IOPort SSerial 0 RXData6 (In)
TB1-21,22 18 IOPort SSerial 0 TXData6 (Out)
TB1-11,12 19 IOPort SSerial 0 RXData5 (In)
TB1-13,14 20 IOPort SSerial 0 TXData5 (Out)
TB1-3,4 21 IOPort SSerial 0 RXData4 (In)
TB1-5,6 22 IOPort SSerial 0 TXData4 (Out)
TB2-19,20 23 IOPort SSerial 0 RXData3 (In)
TB2-21,22 24 IOPort SSerial 0 TXData3 (Out)
TB2-11,12 25 IOPort SSerial 0 RXData2 (In)
TB2-13,14 26 IOPort SSerial 0 TXData2 (Out)
Internal-EncMux 27 IOPort MuxedQCountSel 0 MuxSel0 (Out)
TB3-1,2,9,10 28 IOPort MuxedQCount 0 MuxQ-A (In)
TB3-4,5,12,13 29 IOPort MuxedQCount 0 MuxQ-B (In)
TB3-7,8,12,13 30 IOPort MuxedQCount 0 MuxQ-IDX (In)
TB3-17,18,TB2-1,2 31 IOPort MuxedQCount 1 MuxQ-A (In)
TB3-20,21,TB2-4,5 32 IOPort MuxedQCount 1 MuxQ-B (In)
TB3-23,24,TB2-7,8 33 IOPort MuxedQCount 1 MuxQ-IDX (In)

IO Connections for P2
DB25 pin# I/O Pri. func Sec. func Chan Sec. Pin func Sec. Pin Dir

1 34 IOPort None
14 35 IOPort None
2 36 IOPort None
15 37 IOPort None
3 38 IOPort None
16 39 IOPort None
4 40 IOPort None
17 41 IOPort None
5 42 IOPort None
6 43 IOPort None
7 44 IOPort None
8 45 IOPort None
9 46 IOPort None
10 47 IOPort None
11 48 IOPort None
12 49 IOPort None
13 50 IOPort None

twincnc@twincnc:~$

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PCW
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24 Feb 2026 16:43 - 24 Feb 2026 17:13 #343413 by PCW

Replied by PCW on topic 7i76EU+7i85+7i84U

Might be cable wiring (if you never even get a green blink from the 7I84U, there is no communication)

As tommylight asked, do you have both field powers applied ( A and B )?

Last edit: 24 Feb 2026 17:13 by PCW.

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tommylight
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24 Feb 2026 16:56 #343414 by tommylight

Replied by tommylight on topic 7i76EU+7i85+7i84U

PCW wrote:
(A and ?

Should be
( A and B )?
-
B with ) is translated to smiley face with glasses ...

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Todd Zuercher
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24 Feb 2026 17:15 #343416 by Todd Zuercher

Replied by Todd Zuercher on topic 7i76EU+7i85+7i84U

Yes both A and B.

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Todd Zuercher
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24 Feb 2026 17:38 #343419 by Todd Zuercher

Replied by Todd Zuercher on topic 7i76EU+7i85+7i84U

Here's the power connector

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PCW
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24 Feb 2026 18:37 #343420 by PCW

Replied by PCW on topic 7i76EU+7i85+7i84U

I'll test this setup later today.

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rodw
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24 Feb 2026 22:40 #343436 by rodw

Replied by rodw on topic 7i76EU+7i85+7i84U

Take care here, Network cabling comes in two different flavours T568B and T568A. Google for the difference
In my case, Mesa's serial port manual describes one of these standards but in my country the normal standard was the other!
I drew up my own pin out diagram converting the wire colours to be correct and my 7i73 woke up!

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7i76EU+7i85+7i84U

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