D-2 L60 Line Phase Comparison System GE MultilinD.1 PROTOCOL APPENDIX DDWhen using an unbalanced link layer, the following Application Service Data Unit (ASDU) types are returned in class 2messages (low priority) with the indicated causes of transmission: The standard assignment of ASDUs to class 2 messages is used as follows: A special assignment of ASDUs to class 2 messages is used as follows:5. APPLICATION LAYERTransmission Mode for Application Data:Mode 1 (least significant octet first), as defined in Clause 4.10 of IEC 60870-5-4, is used exclusively in this companionstandard.Common Address of ASDU: One Octet Two OctetsInformation Object Address: One Octet Structured Two Octets Unstructured Three OctetsCause of Transmission: One Octet Two Octets (with originator address). Originator address is set to zero if not used.Maximum Length of APDU: 253 (the maximum length may be reduced by the system.Selection of standard ASDUs:For the following lists, the boxes indicate the following: – used in standard direction; – not used; – cannot beselected in IEC 60870-5-104 standard.Process information in monitor direction <1> := Single-point information M_SP_NA_1 <2> := Single-point information with time tag M_SP_TA_1 <3> := Double-point information M_DP_NA_1 <4> := Double-point information with time tag M_DP_TA_1 <5> := Step position information M_ST_NA_1 <6> := Step position information with time tag M_ST_TA_1 <7> := Bitstring of 32 bits M_BO_NA_1 <8> := Bitstring of 32 bits with time tag M_BO_TA_1 <9> := Measured value, normalized value M_ME_NA_1 <10> := Measured value, normalized value with time tag M_NE_TA_1 <11> := Measured value, scaled value M_ME_NB_1 <12> := Measured value, scaled value with time tag M_NE_TB_1 <13> := Measured value, short floating point value M_ME_NC_1 <14> := Measured value, short floating point value with time tag M_NE_TC_1 <15> := Integrated totals M_IT_NA_1 <16> := Integrated totals with time tag M_IT_TA_1 <17> := Event of protection equipment with time tag M_EP_TA_1 <18> := Packed start events of protection equipment with time tag M_EP_TB_1 <19> := Packed output circuit information of protection equipment with time tag M_EP_TC_1 <20> := Packed single-point information with status change detection M_SP_NA_1
