controlling servos simultaneously

[hyperons]

Hi,

I am using a pololu serial 8 micro controller to control 8 servos simultaneously.  I am sending commands over the serial port.  The approach is to send a 5 byte decimal array that is converted into a string and then sent using the VISA write function.  The array being converted is [128 1 2 servo num position] ex: [128 1 2 0 0].  If I combine two commands into 1 array i.e. [128 1 2 0 0 128 1 2 1 0] then I can get 2 servos to move simultaneously, but if I try to combine 3 commands in one array the controller doesn't respond.  I have also tried splitting up the arrays and then converting them to strings and then concatenating the string, though I get the same error as before.  I was wondering if anyone has tried something similar to this and was able to get it to work.  I am using a 30 amp power supply so I dont think I have problem where I am drawing too much current if I try and run the servos simultaneously. Attached is a vi I am using.

[AleAlejandro]

How many bits are you using per query? It could be that you are going over the set limit. Could you verify that for us?

Regards,

[hyperons]

Hi,

I am using the visa serial port, and the inputs I have set are 9600 baud rate, 8 bits, 0 for parity error and 1 stop bit.  Hopefully this is what you were asking about, if not please let me know, I am pretty new to this, so I am not entirely sure if that is what you are asking about.

thanks