Honeywell CM4 - Protocol Command Definition; Status and Query Commands; NOP - 0 X28; Get System Information - 0 X30

11 Rev. 2.4 (3/05)
Honeywell Analytics CM4 Protocol Manual
Protocol Command Denition
Status and Query Commands
These commands indicate the function and expected response format
for each command. Command numbers are in hexadecimal. If a
specic response is required, the response packet will have the same
command code as the command packet sent to the slave. If no specic
response packet is specied, a general ACK response is sent to
acknowledge the command.
NOP - 0x28 This is used to test for communication between the
master and the specied slave.
Command packet to instrument:
Command Code (0x28) - 1 byte
Get System This packet requests information about the slave system
Information only and the software version currently in use.
0x30
Command packet to instrument:
Command Code (0x30) - 1 byte
Response packet from instrument:
Command Code (0x30) - 1 byte
CM4 Date - 2 bytes
CM4 Time - 2 bytes
Serial # - 2 bytes, product code 851 is assumed.
Software Rev.
Major - 1 byte
Minor - 1 byte
VIP - 2 bytes - 0xFFFF as default
Prom Check Sums
MSB PROM - 2 bytes
LSB PROM - 2 bytes
Status - 1 byte
0x00 Read veried
0xff Error in reading
Software Rev. Examples (Major/Minor/VIP):
01/07/FFFF - Rev. 1.07
03/0C/FFFF - Rev. 3.12
03/0C/0066 - Rev. 3.12-102
04/12/017A - Rev 4.18-378