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Discussion Groups | AT91SAM ARM | AT91SAM7S128- RS485 driver implementation
For users of the Atmel AT91SAM7 and AT91SAM9 ARM CPU chips. Atmel has taken a new direction by combining on chip flash and ram with the ARM CPU on a single die. This provides low cost devices for small systems using the ARM CPU. This group is to exchange information to help users get started and learn how to use the devices.
AT91SAM7S128- RS485 driver implementation - jaya...@gmail.com - Nov 2 8:55:04 2009
Hi Friends,I'm working with AT91SAM7S128 board.I configured the DBGU unit to operate as
simple UART and i tested it in loopback mode,it is working fine.Now i need to communicate
with a device(configured as slave) over RS485 using MODBUS protocol(RTU mode) and baudrate
i'm using is 9600bps.I tried by sending with the specific packet defined but i'm not able
to receive the response from the slave device.Please help me to find the solution for this
problem.
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Re: AT91SAM7S128- RS485 driver implementation - _wsw_ - Nov 3 15:02:37 2009
--- In A...@yahoogroups.com, jaya.19may@... wrote:
>
> Hi Friends,I'm working with AT91SAM7S128 board.I configured the DBGU unit to operate as simple UART and i tested it in loopback mode,it is working fine.Now i need to communicate with a device(configured as slave) over RS485 using MODBUS protocol(RTU mode) and baudrate i'm using is 9600bps.I tried by sending with the specific packet defined but i'm not able to receive the response from the slave device.Please help me to find the solution for this problem.
>
Sorry, my magic glass sphere is a little bit too foggy to tell you the line number where your problem is, but maybe you could tell us a little more about how you control the direction of the RS485 drivers?
------------------------------------
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Re: AT91SAM7S128- RS485 driver implementation - "rao...@rocketmail.com" - Nov 4 9:14:31 2009
i need the detail of the arm modbus
--- In A...@yahoogroups.com, "_wsw_" wrote:
>
> --- In A...@yahoogroups.com, jaya.19may@ wrote:
> >
> > Hi Friends,I'm working with AT91SAM7S128 board.I configured the DBGU unit to operate as simple UART and i tested it in loopback mode,it is working fine.Now i need to communicate with a device(configured as slave) over RS485 using MODBUS protocol(RTU mode) and baudrate i'm using is 9600bps.I tried by sending with the specific packet defined but i'm not able to receive the response from the slave device.Please help me to find the solution for this problem.
> >
> Sorry, my magic glass sphere is a little bit too foggy to tell you the line number where your problem is, but maybe you could tell us a little more about how you control the direction of the RS485 drivers?
>
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
--- In A...@yahoogroups.com, "_wsw_"
>
> --- In A...@yahoogroups.com, jaya.19may@ wrote:
> >
> > Hi Friends,I'm working with AT91SAM7S128 board.I configured the DBGU unit to operate as simple UART and i tested it in loopback mode,it is working fine.Now i need to communicate with a device(configured as slave) over RS485 using MODBUS protocol(RTU mode) and baudrate i'm using is 9600bps.I tried by sending with the specific packet defined but i'm not able to receive the response from the slave device.Please help me to find the solution for this problem.
> >
> Sorry, my magic glass sphere is a little bit too foggy to tell you the line number where your problem is, but maybe you could tell us a little more about how you control the direction of the RS485 drivers?
>
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )