Honeywell VC4 User Manual page 150

1 = old (previously read)
bit 7: Instrument Fault
0 = maintenance fault - the VC4™'s ability to monitor is not compromised.
1 = instrument fault - the VC4™'s ability to monitor is compromised.
Get K-Factor - 0x3E
This command will inquire about K-Factor settings for all points. An individual point is assigned
with a K-Factor times 1000 (a K-Factor of 1.000 is sent as 1000). The K-Factor is used to
change the sensitivity of a point in the range of 0.200-5.000. This adjustment is made after the
calculation of concentration.
Command packet to instrument:
Command Code (0x3E) - 1 byte
Response packet from instrument:
Command Code (0x3E) - 1 byte
VC4™ Date - 2 bytes
VC4™ Time - 2 bytes
K-Factor (x 1000) Point 1 - 2 bytes
K-Factor (x 1000) Point 2 - 2 bytes
K-Factor (x 1000) Point 3 - 2 bytes
K-Factor (x 1000) Point 4 - 2 bytes
Status
0x00 = Point read
0xff = Read problem
Get Pump Limits - 0x43
This command returns the user's settings for pump limits.
Command Packet to slave:
Command Code (0x43) - 1 byte
Response from slave:
Command code (0x43) - 1 byte
VC4™ date 2 bytes
VC4™ time 2 bytes
High Limit - 2 bytes (defaults to 600)
Low Limit - 2 bytes (defaults to 400)
Status - 1 byte (always 0x00 as currently implemented)
VC4™ 150 User Manual