GE General Electric Outboard Motor LM10 Manuale Utente
CHAPTER 5: COMMUNICATIONS
SERIAL PORT
LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
5–63
5.2
Serial Port
5.2.1
Description
This is a standard RS232 port to handle the serial messages. It has a fixed port settings of
19200, 8, N, 1. The PDU uses this port. The protocol for request and response of data is a
fixed 8-byte packet. It will always start with SOH and end with a simple checksum (~sum +
1). The packets will include all the functionality found in the DeviceNet Extension object.
The data is in ‘big endian’ format here (big end first: MSB-LSB). The packet is outlined below:
19200, 8, N, 1. The PDU uses this port. The protocol for request and response of data is a
fixed 8-byte packet. It will always start with SOH and end with a simple checksum (~sum +
1). The packets will include all the functionality found in the DeviceNet Extension object.
The data is in ‘big endian’ format here (big end first: MSB-LSB). The packet is outlined below:
Bit Position
Name
Bit 7
SOH
Bit 6
Service
Bit 5
Attribute
Bit 4
Data 3
Bit 3
Data 2
Bit 2
Data 1
Bit 1
Data 0
Bit 0
Checksum