Honeywell VC4 User Manual page 168

Operation
VC4™ Instrument Power-up
Upon power-up, the VC4™ instrument conducts a self-diagnostic procedure to check its
memory, hardware, and voltages. After the self-diagnostics, the instrument automatically
begins monitoring, and the COM port (if enabled) is activated.
Commands
Your VC4™ instrument will accept and process commands sent to it from your equipment.
Responses
The VC4™ instrument will send a return communication for any message it receives at its
address. Included in most response packets from the VC4™ instrument are date and time
stamps.
Example Packets
The following section contains examples of packets from a master to a slave and the slave's
responses. Protocol version 2 is used. The address of the slave is 1. All numbers are in
hexadecimal.
Master
Slave
Master
Slave
Master
Slave
Master
Slave
VC4™
40 01 00 06 28 91
40 00 01 06 20 99
40 01 00 06 31 88
40 00 01 20 31 24 A6 47 31 5E C1 02 00 00 00 00
00 FF FF FF FF 00 B9 00 A5 00 A4 00 CD 00 00 40
40 01 00 06 35 84
40 00 01 30 35 24 A6 47 33 01 4E 48 33 2D 49 49
00 81 00 FA 01 F4 02 EE 02 EE 50 54 31 2D 43 4D
34 2D 38 35 31 2D 30 30 30 36 20 20 20 20 00 39
40 01 00 06 37 82
40 00 01 21 37 24 A6 47 35 4E 48 33 2D 49 49 81
00 B9 24 A6 47 10 24 A6 47 35 00 00 00 00 00 00
F8
168 User Manual