SML comms with TUF2000M seem incorrect

[pkkrusty]

Trying to pull registers from TUF-2000M ultrasonic flow meter, and having issues.

Comms are normal 9600 8N1. I have it connected via software serial on gpio5 and 4. Script is as follows:

>D 48
SB=4096
IP=192.168.100.100
cut=0
hstr=""
res=0
tmp=0
astr=""
flow=0
velocity=0
posaccum=0
pipeinner=0
negaccum=0
netaccum=0
month=0
today=0
error=0
>B
smlj=0
=>sensor53 r

>S
if (upsecs==10) {
smlj=1
}
if (upsecs==86400) {
=>restart 1
}

flow = sml[1] 
velocity = sml[2]
posaccum = sml[8]
negaccum = sml[9]
pipeinner = sml[3]
netaccum = sml[7]
month = sml[5]
today = sml[4]
error = sml[6]

>J
,"TUF2000M":{
"Flow":%3flow%,
"Velocity":%3velocity%,
"Net_Accum":%3netaccum%,
"Pos_Accum":%3posaccum%,
"Neg_Accum":%3negaccum%,
"Pipe_Inner":%0pipeinner%,
"Day_Total":%3today%,
"Month_Total":%3month%,
"Error":%0error%
}

>E

>M 1
+1,4,m,0,2400,modbus,5,10,r010300010006,010300DD,r0103007D0004,01030048,01030071,01030073,01030075
1,so3=128
1,01030cffffffff@i0:1,Flow,m3/hr,Flow,3
1,01030cx8ffffffff@i0:1,Velocity,m/s,Velocity,3
1,010304ffffffff@i1:1,Pipe Inner,mm,Pipe_Inner,0
1,010308ffffffff@i2:1,Today Total,m3,Day_Total,3
1,010308x4ffffffff@i2:1,Month Total,m3,Month_Total,3
1,010304UUuu@i3:1,Error,x,Error,0
1,010304ffffffff@i4:1,Net Accumulator,m3,Net_Accum,0
1,010304ffffffff@i5:1,Positive Accumulator,m3,Pos_Accum,0
1,010304ffffffff@i6:1,Negative Accumulator,m3,Neg_Accum,0
#

And the comms I get from the unit are as follows:

00:09:45.109 > 01 03 00 01 00 0e 95 ce 
00:09:45.157 : 01 02 18 00 00 00 00 00 00 00 00 00 00 90 8e 00 c0 00 18 00 00 e4 00 38 0e fe fe fe fe 00 00 c2 
00:09:45.199 : 00 
00:09:46.110 > 01 03 00 19 00 02 15 cc 
00:09:46.174 : 01 02 00 00 00 f8 90 30 00 
00:09:47.160 > 01 03 00 dd 00 02 54 31 
00:09:47.223 : 01 02 00 00 80 00 00 20 80 
00:09:48.110 > 01 03 00 7d 00 04 d4 11 
00:09:48.177 : 01 02 00 00 00 c2 0e 02 90 00 00 40 02 
00:09:49.159 > 01 03 00 48 00 02 44 1d 
00:09:49.222 : 01 02 00 00 00 00 00 80 12 

Example 1: When the unit responds to my request of 01 03 00 01 00 0e, I am not seeing the normal pattern of 01 03 1C xx xx cs cs instead seeing 01 02 18 xx xx cs cs.

While there are values being returned, they don't make sense and scripting isn't transferring them into the GUI.

Example 2: register 221 (0xDD) is pipe inner diameter, which is entered in the unit as 97mm. Value returned is 00 80 00 00 which is in normal IEEE754 float according to manual. Online calculators show that to be a nonsense value (1.175e-38).

Any ideas on where I should be looking?

A source online indicated that feeding the unit with 24v is necessary (although it says it can accept 9v-36v) for Modbus to work. I've tried at 19.5v and 9v, same result.

When I switch to hardware serial GPIO3 and 1, I get no response in Tasmota console:

00:32:48.473 > 01 03 00 01 00 0e 95 ce 
00:32:49.482 > 01 03 00 19 00 02 15 cc 
00:32:50.481 > 01 03 00 dd 00 02 54 31 
00:32:51.481 > 01 03 00 7d 00 04 d4 11 
00:32:52.483 > 01 03 00 48 00 02 44 1d 

but RS485 adapter is blinking Tx and Rx. Another thread indicated that this unit replies back with the command received.

EDIT

Reduced comms rate to 2400bps and responses became normal.

[pkkrusty]

New problem, everything is working correctly except reading sml[1]. SML dump shows correct value is received:

13:57:03.434 > 01 03 00 01 00 06 94 08 
13:57:03.576 : 01 03 0c 41 f2 00 00 00 00 e2 0c 3f 91 c8 78 6a af 

41 f2 00 00 corresponds to 30.375ish float value. But what shows up in the GUI is:

modbus Flow | 0.000 m3/hr
modbus Velocity | 1.131 m/s
modbus Pipe Inner | 97 mm
...

[pkkrusty]

If I add another meter line at the end, it captures the value correctly:

>M 1
+1,4,m,0,2400,modbus,5,10,r010300010006,010300DD,r0103007D0004,01030048,01030071,01030073,01030075,01030001
1,so3=128
1,01030cffffffff@i0:1,Flow,m3/hr,Flow,3
1,01030cx8ffffffff@i0:1,Velocity,m/s,Velocity,3
1,010304ffffffff@i1:1,Pipe Inner,mm,Pipe_Inner,0
1,010308ffffffff@i2:1,Today Total,m3,Day_Total,3
1,010308x4ffffffff@i2:1,Month Total,m3,Month_Total,3
1,010304UUuu@i3:1,Error,x,Error,0
1,010304ffffffff@i4:1,Net Accumulator,m3,Net_Accum,0
1,010304ffffffff@i5:1,Positive Accumulator,m3,Pos_Accum,0
1,010304ffffffff@i6:1,Negative Accumulator,m3,Neg_Accum,0
1,010304ffffffff@i7:1,Flow,m3/hr,Flow,3
#