284RS-232C Communication Chapter 11Note for the settings of PLC• If the PLC does not allow data writing in RUN mode, the PV310 cannot write data, resulting incommunication error. If you use the PLC that can select either allow or forbid the PV310 to write data, setto allow data writing.• For Mitsubishi A- and Q- series PLC:You can use only the special protocol for MELSEC A-series computer link unit, “Format 4”, tocommunicate properly (Formats 1, 2, 3 and 5, which are the special protocols for Q series, are notavailable). Make sure that Format 4 is set in the PLC and the settings are valid.Also, set Sum check to "Yes".• For Mitsubishi FX- series PLC:Store “0” in the register for specifying communication formatRegister for specifying communication format: D8120 (or D8420)• For Allen-Bradley SLC500,Configure the following settings:- Duplicate Detect: OFF- ACK Timeout (*20 ms): 20- Control Line: NO HANDSHAKING- Error Detect: BCC- NAK Retries: 3- ENQ Retries: 0- Embedded Responses: AUTO DETECT(Only integer registers are available.)Connecting with PLCRefer to page 40 for serial connection with the PLCs.Be sure to connect cables to the following terminals on the terminal block even in the computer link communicationto control them accordance with the PV310 state.• READY signal (RDY)• ERROR signal (ERR)Output DataWhen PV310 executes inspection, the following data are output from serial port (COM1 only).The items that have been set to output in the “General Output” tab by selecting “ENVIRONMENT” > “Data OutputSettings” from the menu bar.Input / Output Output Order1. Number of scans2. Judgment results (up to 96 data)3. Numeric calculation data (up to 96 data)Output:Output data fromPV310 duringinspection4. Statistics data (up to 96 data)Output SettingsIn the following cases, the data of each of Scans, Numeric Calculation, and Statistics are not output to the serialport (unset registers are skipped).• Each data is set to “Out” under the “General Output” tab, but the setting data do not exist.• The setting data exist, but each data is set to “None” under the “General Output” tab.