The serial ports are configured differently on the current models than they were on the HMI500 Series.
In order to use the same communication cable as the HMI500 Series, insert a null-modem gender-changer (Part Number 2117-0910) on the HMI end of the cable for RS232. For RS485, insert a gender-changer only (Part Number 2117-0903).
You can order parts by contacting our sales team.