Moxa UPort 1250I [49/50] Setting the serial parameters
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Moxa UPort 1250I [49/50] Setting the serial parameters

Moxa UPort 1450I [49/50] Setting the serial parameters
UPort 1200/1400/1600 Series Driver Installation
2-37
Setting the Serial Parameters
After installing the Moxa Linux Driver, you will be able to configure parameters.
1. Serial Interface:
The UPort 1250/1250I/1450/1450I/1650-8/1650-16 supports four interfaces: RS-232, RS-485 2W,
RS-485 4W, RS-422. If you want to switch to a different interface, execute the setserial command to set the
port’s interface. The supported parameters are listed below.
Parameter Value Interface
0x0 RS-232
0x1 RS-485 2W
0x2
RS-422
0x3 RS-485 4W
Example:
(i)
The following command sets
the interface of “/dev/ttyMXUSB0” to RS-422:
# setserial /dev/ttyMXUSB0 port 0x2
(ii)
Use the following command to l
ook up the serial settings of the current port:
# setserial
-g /dev/ttyMXUSB0
2. Serial Baudrate:
spd_hi
Use 57.6
KB when the application requests 38.4 KB.
spd_vhi
Use 115.2
KB when the application requests 38.4 KB.
spd_shi
Use 230 KB when the application requests 38.4 KB.
spd_warp
Use
460 KB when the application requests 38.4 KB.
spd_normal
Use 38.4
KB when the application requests 38.4 KB.
Example:
# setserial /dev/ttyMXUSB0 spd_vhi
Troubleshooting
1. Compile error
Building a Moxa driver requires kernel header files. If you get a compile error, run
rpm -qa | grep kernel to check if the kernel-source package is installed properly. If not, get the
kernel-source irpm package and run rpm -ivh <pacakge> to install it. You also need to make sure the
build tool is ready by including make/gcc/lib. See Linux related documents for more information.
2. No such file or directory
This problem occurs when a device node is not generated automatically when loading the driver. It usually
happens with previous kernel versions, such as versions 2.6.0 to 2.6.5. Therefore, just execute the make
node script “upmknod” to generate the device node.

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