7i97T + 7i74 + 7i84U – No Smart Serial Communication

Cristy13
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1 month 2 weeks ago #349637 by Cristy13

7i97T + 7i74 + 7i84U – No Smart Serial Communication was created by Cristy13

Hi,I am retrofitting a CNC lathe with LinuxCNC and I have the following Mesa hardware:

1x Mesa 7i97T
1x Mesa 7i74
4x Mesa 7i84U
IDC26 to DB25 adapter
DB25 male-male 1:1 cable between 7i97T P2 and 7i74
standard straight-through CAT5e cables between 7i74 and 7i84U

The problem is that none of the 7i84U boards are detected over Smart Serial.The 7i97T is reachable at:

Code:

192.168.1.121

I am using firmware:

Code:

7i97t_7i74d.bin

MD5:

Code:

4130ebee623115267327c166f8da9d39

I also verified the firmware in flash with:

Code:

mesaflash --device 7I97T --addr 192.168.1.121 --verify /home/cnc/7i97t_7i74d.bin

and I get:

Code:

Board FLASH memory verified successfully

Code:

mesaflash --device 7I97T --addr 192.168.1.121 --sserial

gives only:

Code:

SSLBP port 0:

Code:

SSLBP Version: 1.43

Code:

SSLBP Channels: 8

Code:

SSLBP Baud Rate: 2500000

but no 7i84U devices are listed.I tested 7i84U boards on CH1 and CH2 of the 7i74 with the same result.On the 7i84U:

W3 = LEFT / operate mode / 2.5 Mbaud
VIN = about 28 V
VFIELD A = about 28 V
VFIELD B = about 28 V
CR2 ON
CR7 ON
CR5 red ON
CR6 green OFF / never blinks

On the 7i74:

CR1 is ON
I initially measured only about 4.5 V
I changed it to external regulated 5 V supply
now TB1 measures 5.08 V
the problem is still exactly the same

I checked the RJ45 cable and it is straight-through:

Code:

1-1, 2-2, 3-3, 4-4, 5-5, 6-6, 7-7, 8-8

I also tested the 7i97T P2 interface with W21 UP and P2 disconnected:

Code:

mesaflash --device 7I97T --addr 192.168.1.121 --rpo 0x1008

Result:

Code:

0001FFFF

So that test appears to pass.

Code:

readhmid

also shows the expected Smart Serial signals:

Code:

RXData0/TXData0

on the 7i97T and

Code:

RXData1...7 / TXData1...7

for the 7i74 channels.I also tried loading HostMot2 manually:

Code:

halrun

Code:

loadrt hostmot2

Code:

loadrt hm2_eth board_ip=192.168.1.121 config="sserial_port_0=x0xxxxxx"

The 7i97T loads and registers normally, but the 7i84U is still not detected.Everything is new hardware.At this point I suspect either the 7i74 itself, the IDC26/DB25 path between P2 and the 7i74, or something I am missing in the Smart Serial configuration.Does anyone have a known-good 7i97T + 7i74 + 7i84U setup and can tell me what I should test next?In particular:

Is

Code:

sserial_port_0=x0xxxxxx

correct for a 7i84U connected to CH1 of the 7i74?
Is there a direct test for TX/RX on the 7i74 without an oscilloscope?
Are there any jumpers/settings on the 7i74 or 7i84U that I may have missed?

Thanks.