Digi One IAP splitting raw serial data into several IP packets

I’ve noticed when I transmit serial data across the network the data will split across multiple packets. The process seems arbitrary and seems to affect the data no matter the length of the serial transmission. The serial data will never max out above 28 characters but may be less and will always be terminated with characters. Is there a way to configure the device such that it only sends out one packet for each transmission instead of splitting across multiples?