4. MODBUS
COMMUNICATIONS
ii
TABLE OF CONTENTS
3.5.4
3.5.5
STATUS ................................................................................................... 3-13
3.5.6
ACTUAL VALUES.................................................................................... 3-14
3.5.7
SETPOINTS............................................................................................. 3-14
3.5.8
COMMANDS............................................................................................ 3-14
3.5.9
FILE ......................................................................................................... 3-15
3.5.10 INFO ........................................................................................................ 3-15
3.5.11 RETURN .................................................................................................. 3-15
3.6.1
4.1.1
DESCRIPTION .......................................................................................... 4-1
4.1.2
4.1.3
4.1.4
DATA PACKET FORMAT .......................................................................... 4-2
4.1.5
TIMING ...................................................................................................... 4-2
4.1.6
ERROR CHECKING .................................................................................. 4-3
4.2.1
DESCRIPTION .......................................................................................... 4-4
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
ERROR RESPONSES............................................................................... 4-9
4.3.1
MODBUS MEMORY MAP ....................................................................... 4-10
4.3.2
5.1.1
DESCRIPTION .......................................................................................... 5-1
5.2.1
5.2.2
5.2.3
5.2.4
5.3.1
DESCRIPTION ........................................................................................ 5-10
5.4.1
5.4.2
IAC INVERSE CURVES .......................................................................... 5-14
5.4.3
5.4.4
5.5.1
5.5.2
IEC A CURVES........................................................................................ 5-22
5.5.3
IEC B CURVES........................................................................................ 5-24
5.5.4
IEC C CURVES ....................................................................................... 5-26
735/737 Feeder Protection Relay
GE Power Management