UPort 1250i Linux Configuration

[Unfx]

Hello all,

I'm trying to use Uport 1250i for 2 wire RS485 communication. My operating system is Ubuntu 18.04. I see that it is recognized well by the Linux kernel.

Feb 17 10:01:17 r300021513 kernel: [    2.031006] usb 1-1: New USB device found, idVendor=110a, idProduct=1251
Feb 17 10:01:17 r300021513 kernel: [    2.031007] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Feb 17 10:01:17 r300021513 kernel: [    2.031008] usb 1-1: Product: MOXA UPort 1250I
Feb 17 10:01:17 r300021513 kernel: [    2.031008] usb 1-1: Manufacturer: MOXA Technologies

Feb 17 10:01:17 r300021513 kernel: [    6.545204] usbcore: registered new interface driver mxuport
Feb 17 10:01:17 r300021513 kernel: [    6.545210] usbserial: USB Serial support registered for MOXA UPort

Feb 17 10:01:19 r300021513 kernel: [    9.752962] mxuport 1-1:1.0: Using device firmware version v1.4.1
Feb 17 10:01:19 r300021513 kernel: [    9.752966] mxuport 1-1:1.0: MOXA UPort converter detected
Feb 17 10:01:19 r300021513 kernel: [    9.753393] usb 1-1: MOXA UPort converter now attached to ttyUSB1
Feb 17 10:01:19 r300021513 kernel: [    9.753603] usb 1-1: MOXA UPort converter now attached to ttyUSB2

 

I can communicate via RS232 without a problem. However when I connect an RS485 device to D+ D- pins, I cannot. In the manual it says run

setserial /dev/ttyUSB1 port 0x1

for 2 wire RS485. But when I run this, it returns;

Cannot get serial info: Inappropriate ioctl for device

 

So, I'm stucked. How can I use this device in Ubuntu 18.04 (4.15.0-135-generic) with 2 wire RS485 configuration?

Best Regards

[Знайка]

Hello, which driver version was used?

[Unfx]

Hello,

Is this information sufficient? If not please guide me how to get the driver version.

 

modinfo mxuport
filename:       /lib/modules/4.15.0-135-generic/kernel/drivers/usb/serial/mxuport.ko
license:        GPL
author:         <support@moxa.com>
author:         Andrew Lunn <andrew@lunn.ch>
srcversion:     228F3A178FF4B8853712E3E
alias:          usb:v110Ap1653d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1613d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1658d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1618d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1451d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1450d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1410d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1251d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v110Ap1250d*dc*dsc*dp*ic*isc*ip*in*
depends:        usbserial
retpoline:      Y
intree:         Y
name:           mxuport
vermagic:       4.15.0-135-generic SMP mod_unload
signat:         PKCS#7
signer:         
sig_key:        
sig_hashalgo:   md4

 

[Знайка]

Where did you get the driver you used? What name of the file it had?

[Unfx]

Hello, thank you for the reply. It’s already included in. I did not install any driver. I think ubuntu linux kernel modules includes this moxa driver.

[Знайка]

Try this one https://yadi.sk/d/l8D9Y5aY00MNrQ version 5.0.7

[Unfx]

Since my kernel is 4.15, will this one be suitable? It says kernel 5.x

thanks

[Знайка]

You're absolutely right, for your case you should use this https://moxa.ru/files/drivers_utilities_3/1600-series-driver-v4_01.zip

[Unfx]

Thanks. This one seems to work. Now I have port names as ttyMXUSB0 and ttyMXUSB1 instead of ttyUSB0 and ttyUSB1.

For communicating with RS485 device, I run

setserial /dev/ttyMXUSB0 port 0x1

After this command, I can receive serial messages but they are very slow and sometimes missing some of the ending bytes. Is there a configuration to alter latency and speed of the device? Maybe some timeouts etc.?

 

Thnaks

[Знайка]

If your task is to increase the line throughput you should increase the bitrate on the both ends of the line.

[Unfx]

In fact, it may not be related with bitrate. It is 115200 and I can read very well with another RS485 converter (ICPDAS brand). When I change it with Moxa 1250i, messages stall sometimes. They are not constantly arriving. Messages are generally corrupted and arriving slowly. I thought as a driver issue.

[Знайка]

Did you try to terminate the line or to install Pull Hi\Lo resistors?