Expanding 7i97 Smart Serial Ports using SP491 chip

So the loadrt line will stay unchanged?

loadrt hm2_eth board_ip="10.10.10.10" config=" num_encoders=6 num_pwmgens=6 num_stepgens=0 sserial_port_0=00000000"

All zeros on sserial port?

if you want all sserial devices to run in mode 0

Ok, thank you very much Peter!

I will read a little more about modes, but I believe there is no reason to change, for I was able to make the first 7i84 work on mode 0.

What about the terminating resistors? Is there need for another one on YZ line?

termination is only on RX not TX

Hi Peter! 

Unfortunately, it still won’t work. Only the first 7i84 show up on --sserial. The second one won't make a sound.

I tied REB and DE as you said. At first, I tried with a 10k resistor, it didn’t work. Then I tried with a jumper, didn’t work as well. 

I can’t see what could be wrong. 

There are a couple of pictures of the board attached, maybe someone could spot a mistake. 

If it doesn’t work by the end of next week we will be abandoning this approach a moving to a modbus I/O expansion card instead. 

We thought about using one of this Adam RS232 to RS422 converters. They are also 4 wire full duplex, but the baud rate is not enough. Max is 115200 kbs. Mesa is 2.5 mbs. 

I welcome any suggestion

hank you very much in advance! 

Bruno

Are you sure you have the P1 connections right?

You are showing DB-25 pins, the HDR26 pins would be

RX1 --> 2
TX1 --> 6

OMG, you’re so right! Shame on me! 

I didn’t know there was such db25 adaptor… anyway. 

I was following the vhd file pin mapping, now it all makes sense. I should have used the IO to P1 pin mapping in 7i97 manual. 

Thank you! I’ll be trying it out tomorrow. 

I’m confident it will work now! 

Bruno

The latest version of mesaflash shows both the header and DB25 pins:

P1-01/DB25-01 34 IOPort MuxedQCount 0 MuxQ-A (In)
P1-02/DB25-14 35 IOPort MuxedQCount 0 MuxQ-B (In)
P1-03/DB25-02 36 IOPort MuxedQCount 0 MuxQ-IDX (In)
P1-04/DB25-15 37 IOPort MuxedQCount 1 MuxQ-A (In)
P1-05/DB25-03 38 IOPort MuxedQCount 1 MuxQ-B (In)
P1-06/DB25-16 39 IOPort MuxedQCount 1 MuxQ-IDX (In)
P1-07/DB25-04 40 IOPort MuxedQCount 2 MuxQ-A (In)
P1-08/DB25-17 41 IOPort MuxedQCount 2 MuxQ-B (In)
P1-09/DB25-05 42 IOPort MuxedQCount 2 MuxQ-IDX (In)
P1-11/DB25-06 43 IOPort MuxedQCount 3 MuxQ-A (In)
P1-13/DB25-07 44 IOPort MuxedQCount 3 MuxQ-B (In)
P1-15/DB25-08 45 IOPort MuxedQCount 3 MuxQ-IDX (In)
P1-17/DB25-09 46 IOPort MuxedQCountSel 0 MuxSel0 (Out)
P1-19/DB25-10 47 IOPort None
P1-21/DB25-11 48 IOPort SSerial 0 RXData1 (In)
P1-23/DB25-12 49 IOPort SSerial 0 TXData1 (Out)
P1-25/DB25-13 50 IOPort SSerial 0 TXEn1 (Out)

PCW wrote:

The latest version of mesaflash shows both the header and DB25 pins:

P1-01/DB25-01 34 IOPort MuxedQCount 0 MuxQ-A (In)
P1-02/DB25-14 35 IOPort MuxedQCount 0 MuxQ-B (In)
P1-03/DB25-02 36 IOPort MuxedQCount 0 MuxQ-IDX (In)
P1-04/DB25-15 37 IOPort MuxedQCount 1 MuxQ-A (In)
P1-05/DB25-03 38 IOPort MuxedQCount 1 MuxQ-B (In)
P1-06/DB25-16 39 IOPort MuxedQCount 1 MuxQ-IDX (In)
P1-07/DB25-04 40 IOPort MuxedQCount 2 MuxQ-A (In)
P1-08/DB25-17 41 IOPort MuxedQCount 2 MuxQ-B (In)
P1-09/DB25-05 42 IOPort MuxedQCount 2 MuxQ-IDX (In)
P1-11/DB25-06 43 IOPort MuxedQCount 3 MuxQ-A (In)
P1-13/DB25-07 44 IOPort MuxedQCount 3 MuxQ-B (In)
P1-15/DB25-08 45 IOPort MuxedQCount 3 MuxQ-IDX (In)
P1-17/DB25-09 46 IOPort MuxedQCountSel 0 MuxSel0 (Out)
P1-19/DB25-10 47 IOPort None
P1-21/DB25-11 48 IOPort SSerial 0 RXData1 (In)
P1-23/DB25-12 49 IOPort SSerial 0 TXData1 (Out)
P1-25/DB25-13 50 IOPort SSerial 0 TXEn1 (Out)

Nice! If I had updated it before my job would have been easier!