137 SERIAL (RS232C) Communication ProtocolSERIAL (RS232C) means the EIA standard number of an interface for serial data transfer. With the SERIAL (RS232C) interface,you can control functions of this unit by transferring the specified commands from a personal computer (PC) to this unit.Notes:• This unit does not support the communication converted between the SERIAL (RS232C) and USB interface.• When controlling the unit with the SERIAL (RS232C) interface, the following parameters should be identical between thecommunication devices.The setting is available in "SETUP MENU" – "Comm" – " SERIAL (RS232C) Setting".Baud RateData BitParityStop Bit Command FormatThe following pages detail how to write the commands.1. The following details how to write the commandsSTX: This shows the data start. STX (ASCII code: 02h) is always prefixed to data. h shows hexadecimal digit.Transmission command: A command shown in the Command List is designated.ETX: This shows the data end. ETX (ASCII code: 03h) is always prefixed to data.The character code is ASCII.When a command needs parameter, colon (:) is used for dividing the command and parameter. The following is how towrite the commands when two or more commands are specified.2. Response Command (from the Unit to the PC)The unit sends back the response command for the transmission command from the PC.• When the reception was completed successfullyThe response command differs between when an ANSWER command (sending back the status or data) is required orwhen not required.• When no ANSWER command is requiredThe unit sends back the same identifier as that in the transmission command, as shown in the figure.CodeASCII (02H) – – – – – – – – – – – – – – – – – – – – – – – – – – – (03H)[STX] AD [Unit address of this unit] [Transmission Command] : [p1] : [p2] [ETX]SERIAL (RS232C) CONNECTOR COMMAND REFERENCECode [STX] AD [Unit address of this unit] [Transmission Command] : [p] [ETX][STX] [ETX]OPLSame identifierTransmission command (→ The unit) Response command (← The unit)[STX] [ETX]OPL
