User's Manual

Rs-232 Communication Protocol Sheet 3 of 10 Rev: C Dwg: 817-2435-971
I. Request Packet Format
Data transmission rate is selectable from 115200,57600,19200,9600 bps. Communication format is 8
data bits, no parity bits, and one stop bit. The data packet structure is defined below. Note that the
’Packet ID’ byte uniquely identifies each packet. The CRC value is used to verify that valid data has been
received.
Packet Structure:
Byte 01: Header Byte 1 ASCII code "H” or 72
Byte 02: Header Byte 2 ASCII code "B” or 66
Byte 03: Packet Address Value: 0–63, based on Switch 1 on Board. (See Table 1)
Byte 04: Packet ID Value 0-32 (See Table 2)
Byte 05-XX: Data bytes
Byte XX + 1: 16 bit CRC, MSB
Byte XX + 2: 16 bit CRC, LSB
Notes:
Header Bytes are not included in CRC Calculation.
II. Response Packet Format
Data transmission rate is selectable from 115200,57600,19200,9600 bps via S1 (7-8). Communication
format is 8 data bits, no parity bits, and one stop bit. The data packet structure is defined below. The
CRC value is used to verify that valid data has been received.
Packet Structure:
Byte 01: Header Byte 1 ASCII code "H" or 72
Byte 02: Header Byte 2 ASCII code "B" or 66
Byte 03: Packet Address 255 (Always 255)
Byte 04-XX: Data bytes
Byte XX + 1: 16 bit CRC, MSB
Byte XX + 2: 16 bit CRC, LSB
Notes:
Header Bytes are not included in CRC Calculation.