GE T35 Instruction Manual page 292

D.1 IEC 60870-5-104 PROTOCOL
When using an unbalanced link layer, the following ADSU types are returned in class 2 messages (low priority) with the
indicated causes of transmission:
The standard assignment of ADSUs to class 2 messages is used as follows:
A special assignment of ADSUs to class 2 messages is used as follows:
5. APPLICATION LAYER
Transmission 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 companion
stanadard.
Common Address of ADSU:
One Octet
Two Octets
Ë

Information Object Address:
One Octet
D
Two Octets
Ë Three Octets

Cause of Transmission:
One Octet
Two Octets (with originator address). Originator address is set to zero if not used.
Ë

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:
selected in IEC 60870-5-104 standard.
Process information in monitor direction
Ë
<1> := Single-point information

<2> := Single-point information with time tag
Ë
<3> := Double-point information
<4> := Double-point information with time tag
Ë
<5> := Step position information
<6> := Step position information with time tag
Ë
<7> := Bitstring of 32 bits
<8> := Bitstring of 32 bits with time tag
Ë
<9> := Measured value, normalized value
<10> := Measured value, normalized value with time tag
Ë
<11> := Measured value, scaled value
<12> := Measured value, scaled value with time tag
Ë
<13> := Measured value, short floating point value

<14> := Measured value, short floating point value with time tag
Ë
<15> := Integrated totals

<16> := Integrated totals with time tag
<17> := Event of protection equipment with time tag
<18> := Packed start events of protection equipment with time tag
<19> := Packed output circuit information of protection equipment with time tag
Ë
<20> := Packed single-point information with status change detection
D-2
Ë Structured

Ë Unstructured

Ë – used in standard direction;

T35 Transformer Management Relay
APPENDIX D
Ë – not used; – cannot be
M_SP_NA_1
M_SP_TA_1
M_DP_NA_1
M_DP_TA_1
M_ST_NA_1
M_ST_TA_1
M_BO_NA_1
M_BO_TA_1
M_ME_NA_1
M_NE_TA_1
M_ME_NB_1
M_NE_TB_1
M_ME_NC_1
M_NE_TC_1
M_IT_NA_1
M_IT_TA_1
M_EP_TA_1
M_EP_TB_1
M_EP_TC_1
M_SP_NA_1
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