Unit Functions and Restrictions on Combination1-21.1 Unit Functions and Features1.1.1 Unit Functions Removable serial communication cassettes are used• Can be selected from four communication cassettes (sold separately) that conform withcommunication standards RS-232C and RS-485.• One communication cassette can be attached to the control unit. The control unit has a built-in COM0 port as standard equipmentThe control unit has a built-in RS-232C port (3-wire type) for connection with a programmabledisplay, and a 5V power supply, as standard equipment. Four communication modes are availableDifferent communication modes are available (PLC link, MEWTOCOL, MODBUS-RTU, andgeneral-purpose communication mode). Depending on combination with communicationcassettes, the product can be connected with diverse serial communication devices.1.1.2 Names and Functions of PartsThe names and functions of parts pertaining to communication functions are indicated below.AFP0HC32T AFP0HC32ET① ②③④②③④No. Name Description① Communication cassette(optional) Can be selected and attached from four types of cassettes.② Operation monitor LED(for COM1 / COM2) Flashes during transmission / reception by a cassette③ Operation monitor LED(for COM0) Flashes during transmission / reception by COM0 port④ COM0 portThree-wire RS-232C port. A power supply terminal (5 V) is alsoprovided for connecting our Programmable Display GT02/GT02Lseries.