This Compact Universal Communications Module is user-programmable with a 10BaseT Ethernet port and two switch-selectable RS-232/RS-485 serial ports. It can be used as a bridge, gateway, or data concentrator. Several application layer protocols have been implemented on Ethernet including Modbus/TCP, HTML/HTTP, SNMP (client or server), Cutler-Hammer INCOM, SMTP, Chat, Telnet, and FTP.
Modbus, Modbus TCP/IP
Expand the serial and Ethernet protocols of the Compact PLC; acts as a data concentrator; network host adapter; network gateway; protocol converter; serial host adapter; CAPP Product, Compact Option Module technology, Transparent Ready, Modbus (RTU or ASCII, Master or Slave).
See attached spec. sheet.