Controlling Ultramotion Linear Actuator via RS232 from arduino

I am trying to control an Ultramotion Linear Actuator that takes in strings as commands such as TR TE TA .... etc. I have been able to get the Linear actuator to work using a USB to RS232 converter and the program PuTTY. However i need to control the Actuator with the arduino. I have not been able to get the arduino to control the Actuator so far and i have no clue what the exact problem is that I'm encountering with it. I am using a max2332 circuit breakout board in order to step up the voltage to RS232 levels. I really appreciate any help i receive on this and thank you in advance. Any suggestions as far as trouble shooting the problem or anyone with similar experiences would help greatly. Thanks. The current pin out im using is:

I believe that it would be similar to the following example: https://www.arduino.cc/en/Tutorial/ArduinoSoftwareRS232
However this only takes one character i would need it to take multiple characters (i.e. TA10000) and it also doesn't use the USB to serial connector to take a value which it then echoes out the rx/tx to rs232. it takes a value from an rs232 connector and then outputs back through the rs232 connector. Again any help would be appreciated thank you for your time in advance.