Word variable that contains the number of the data word from where on the receivedcharacters are stored.Word variable that contains the amount of received bytes.At proper function, all bits of this bit memory byte are "0". At errors an error code isentered. The error setting is self-acknowledging, i.e. after elimination of the error cause,the byte is set back to "0" again. The following errors may occur:n 1 = Data block not presentn 2 = Data block too shortn 3 = Data block number outside valid rangeBy setting of EMFR the handling block shows that data has been received. Not until set-ting back EMFR in the user application new data can be received.These parameters are internally used. They serve the information exchange between thehandling blocks. For the deployment of the SYNCHRON_RESET (FC9) the control bitsEMFR, LETZTER_BLOCK, EMPF_LAEUFT and FEHLER_EMPF must always be storedin a bit memory byte.10.3.3 FC 8 - STEUERBIT - Modem functionality CP 240This block allows you the following access to the serial modem lines:Read: DTR, RTS, DSR, RI, CTS, CDWrite: DTR, RTSParametersName Declaration Type CommentADR IN INT Logical AddressRTS IN BOOL New state RTSDTR IN BOOL New state DTRMASKE_RTS IN BOOL n 0: do nothingn 1: set state RTSMASKE_DTR IN BOOL n 0: do nothingn 1: set state DTRRET_VAL OUT WORD Return value (0 = OK)STATUS OUT /IN_OUTBYTE STATUSn Status flags of Type BYTE as OUT parameter,used in CPUs from VIPA or in S7-300 CPUsfrom Siemens.n Status flags of Type BYTE as IN_OUT param-eter, used in S7-1500 CPUs from Siemens.ABDANZPAFEEMFRGEEM, ANZ_INT,LETZTER_BLOCK,EMPF_LAEUFT,FEHLER_EMPF, OFFSETDescriptionVIPA SPEED7 Serial CommunicationCP240 > FC 8 - STEUERBIT - Modem functionality CP 240HB00 | OPL_SP7 | Operation list | en | 18-30 233
