2 Functions of Devices in DVP-PLC Function Group MODEM Connection Function Number M1184 ~ M1188 Contents: 1. The system connection PC DVP-EH/EH2 series MPU WPLSoft is executing. MODEM DVP-F232 interface 2. Special M for MODEM connection for EH2/EH3/SV2: Note: The special Ms are both applicable when PLC is in RUN or STOP status. 3. How to connect (Please follow the steps below): a) Set “On” M1184 (Enable PLC MODEM connection). b) Set “On” M1185 (Enable initialization of MODEM from PLC). c) Check if the initialization of MODEM is successful from M1186, M1187. d) Wait for the connection. 4. Note: a) When PLC is to be connected with MODEM, a RS-232 extension card is required.
If there is no RS-232 extension card, all special M above will be invalid. b) After enabling MODEM (M1184 = On), PLC has to initialize MODEM first (M1185 = On). If PLC fails to initialize MODEM, the auto-answering function of the MODEM will not be enabled. c) After MODEM is initialized, it will enter auto-answering mode automatically. d) If the remote PC is disconnected, MODEM will enter stand-by mode automatically and if the user turns off e) The connection speed is set by PLC as 9,600bps fixed and modification on the speed is not allowed. MODEM now, MODEM will have to be initialized again when it is turned on again. MODEM has to be able to support the speed of 9,600bps and versions above.
f) The initialization format from PLC to MODEM are ATZ and ATS0 = 1. g) If PLC fails to initialize MODEM, use the super terminal in PC to initialize it by the format ATZ and ATS0 = 1. DVP-PLC Application Manual 2-120 ODEM Telecommunication network Device No. Function Note M1184 Enable MODEM On: The following actions are valid M1185 Initialize MODEM Off: Initialization is completed M1186 Fail to initialize MODEM Off: M1185 = On M1187 MODEM initialization is completed Off: M1185 = On M1188 Shows if MODEM is connected On: Connecting