GE DGP Series Instruction Manual page 10

9. COMMUNICATIONS
vi
TABLE OF CONTENTS
8.3.10 INFORMATION KEY [INF] ....................................................................... 8-12
1. REQUEST DGP STATUS......................................................................... 8-12
2. REQUEST FAULT INFORMATION .......................................................... 8-12
3. REQUEST PRESENT VALUES ............................................................... 8-13
4. REQUEST EVENTS ................................................................................. 8-13
5. VIEW PASSWORD................................................................................... 8-13
6. REQUEST DGP MODEL/VERSION......................................................... 8-13
7. STATION ID.............................................................................................. 8-13
8. GENERATOR ID....................................................................................... 8-13
8.4 ERROR MESSAGES
8.4.1 DESCRIPTION ........................................................................................ 8-15
8.5 PASSWORDS
8.5.1 DESCRIPTION ........................................................................................ 8-16
8.5.2 ENCRYPTED PASSWORD CONVERSION TABLE ............................... 8-17
9.1 INTRODUCTION
9.1.1 HARDWARE JUMPERS ............................................................................ 9-1
9.1.2 MODEM CONNECTIONS & SETTINGS ................................................... 9-1
9.1.3 PC MODEM ............................................................................................... 9-1
9.1.4 DGP MODEM ............................................................................................ 9-2
9.1.5 NULL MODEM CONNECTIONS ............................................................... 9-2
9.1.6 RS485 COMMUNICATIONS ..................................................................... 9-4
9.2 MODBUS COMMUNICATIONS
9.2.1 INTRODUCTION ....................................................................................... 9-5
9.2.2 DATA FRAME FORMAT & DATA RATE ................................................... 9-5
9.2.3 DATA PACKET FORMAT .......................................................................... 9-5
a SLAVE ADDRESS ..................................................................................... 9-5
b FUNCTION CODE ..................................................................................... 9-6
c DATA ......................................................................................................... 9-6
d CRC HI & CRC LO..................................................................................... 9-6
9.2.4 ERROR CHECKING .................................................................................. 9-6
9.2.5 DATA FRAMING ........................................................................................ 9-6
9.3 MODBUS FUNCTIONS
9.3.1 FUNCTION CODE 03/04: READING HOLDING/INPUT REGISTERS...... 9-7
a DESCRIPTION .......................................................................................... 9-7
b QUERY ...................................................................................................... 9-7
c RESPONSE ............................................................................................... 9-7
9.3.2 FUNCTION CODE 05: FORCE SINGLE COIL .......................................... 9-8
a DESCRIPTION .......................................................................................... 9-8
b QUERY ...................................................................................................... 9-8
c RESPONSE ............................................................................................... 9-8
9.3.3 FUNCTION CODE 06: STORE SINGLE SETPOINT ................................ 9-9
a DESCRIPTION .......................................................................................... 9-9
b QUERY ...................................................................................................... 9-9
c RESPONSE ............................................................................................... 9-9
9.3.4 FUNCTION CODE 16: PRESET MULTIPLE SETPOINTS...................... 9-10
a DESCRIPTION ........................................................................................ 9-10
b QUERY .................................................................................................... 9-10
c RESPONSE ............................................................................................. 9-10
9.3.5 FUNCTION CODE 56: RETRANSMIT LAST PACKET ........................... 9-10
a DESCRIPTION ........................................................................................ 9-10
b QUERY .................................................................................................... 9-10
c RESPONSE ............................................................................................. 9-10
9.4 MODBUS ERRORS
9.4.1 ERROR RESPONSES............................................................................. 9-11
DGP Digital Generator Protection System
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