To move the PMS output from a serial port to the LAN see ASYDL.
ASYDL, SYS 1, INDEX 897, bit 0 = 1
ASYDL, SYS 1, INDEX 897, bit 4 = 0
Bit 4 is used for ACK/NAK control and is invalid when integrating with a Flagler / LMS system. Your results may vary.
Ethereal running on a hub card port is very revealing when troubleshooting conversation for the first time. L records and responses can be viewed in clear text.