A.6
Modbus Registers
The Modbus version of VESDA Sensepoint XCL allows interaction with the gas detector using Modbus/RTU over an RS-485 physical layer. The Modbus interface provides a
means to monitor and interrogate the detector with the addition of being able to reset alarms remotely. The Modbus registers for VESDA Sensepoint XCL are given in the
following table.
Note:
Functions associated with the relays (if fitted) is limited to the viewing of their associated parameters. It is not possible to set or control the relays over the Modbus
interface.
Modbus
Register
Address
Information
R/W
Type
Size
Description
Notes
30001
Main SW Version of
Instrument
R
u8
1
30002
EEP Version of
Instrument
R
u8
1
30004 to
3009
Location String
R
string [12] 6
Not used in VESDA Sensepoint XCL
30010
Modbus Slave ID
R
u8
1
30011
Monitor Status
R
u16
1
l
1: Normal
l
2: Warm up after power on
l
3: Inhibit
l
12: Calibration
30012
Inhibit Current (mA)
R
u8
1
Not used in VESDA Sensepoint XCL
30013
Reserved
R
u16
1
30014
Active Alarm
R
u32
2
l
Bit 0 Alarm 1 is active
l
Bit 1 Alarm 2 is active
l
Bit 1 Alarm 3 is active (not used)
30016 to
30017
Latched Alarm
R
u32
2
l
Bit 0 Alarm 1 is latched
l
Bit 1 Alarm 2 is latched
l
Bit 2 Alarm 3 is latched (not used)
30018 to
30019
Active Fault
R
u32
2
l
Upper two bytes: fault
l
Lower two bytes: warning
l
Bit 0 to Bit 15: warning
l
Bit 16 to Bit 31: fault
VESDA by Xtralis
VESDA Sensepoint XCL – Large Bore Installation Manual
