Modbus Multi-Drop Mode; Modbus Protocol; Modbus Registers - Honeywell SEARCHLINE EXCEL PLUS Technical Manual

76 Chapter 10 Communications
10.5.6 Modbus Multi-Drop Mode
A maximum of 32 nodes (1 controller, 31 responders) are supported in a multi-drop installation.
10.5.7 Modbus Protocol
Authoritative information on the Modbus protocol can be found at www.modbus.org.
Supported baud rates are 9600 and 19200 with 9600 as the default (none parity, 1 stop bit) and follower addresses
set as 1 by default.
Status reading and configuration of important parameters (adjustable with Honeywell Fixed Platform App and HART)
can also be performed using the Modbus interface. This appendix describes only how to monitor Searchline Excel Plus &
Searchline Excel Edge status using Modbus.
10.5.8 Modbus Registers
Modbus Holding Register
Address
First Last Qty
40001 40001 1
40002 40002 1
40003 40004 2
40005 40005 1
40006 40006 1
40007 40007 1
40008 40008 1
40009 40009 1
40010 40010 1
40011 40011 1
40012 40014 3
40015 40015 1
40016 40016 1
40017 40017 1
40018 40030 13
40031 40035 5
40036 40036 1
40037 40038 2
40039 40039 1
40040 40040 1
40041 40041 1
40042 40042 1
40043 40043 1
40044 40044 1
40045 40045 1
40046 40046 1
40047 40047 1
40048 40052 5
40053 40059 7
40060 40060 1
40061 40061 1
Register Parameter Description
Type
r Modbus responder address
r Detector Id
r Gas reading
r Reserved
r Detector detail status
r Operating state
r Heart Beat
r Discrete or proportional
r Alarm Latch config
r Measurement unit
r Relay status(Active/Inactive)
r ADC Temp. Sensor
r PSU1 Temp. Sensor
r AFE Temp. Sensor
r Device Name
r Reserved
r Sensor type
r mA Output
r Voltage monitor
r Voltage monitor
r Voltage monitor
r Voltage monitor
r Voltage monitor
r Voltage monitor
r Voltage monitor
r Voltage monitor
r Voltage monitor
r Reserved
r Reserved
r Voltage monitor
r Configuration counter
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
Additional Description
MSB -> 0x28
LSB -> Responder address (1 to 247,
address 60 excluded)
Identical to 40001
Reported gas concentration
------
*see notes
*see notes
low 16 bits of SDS variable
0=discrete, 1=proportional
mask of individual alarm latches
------
0=deenergized, 1=energized
------
------
------
From Bluetooth
------
------
mA Output readback current
24V_PROT_SW
5V0_SAFE
12V_SAFE
3V3_SAFE
12V
3V3
5V0
1V2_SAFE
+5V_HTR
------
------
+INTRA_1V2
From HART
Notes
Note 5
Note 5
Note 13
Note 3
Note 8
Note 4
Note 16
Note 15
Note 17
Note 17
Note 17
Note 17
Note 17
Note 17
Note 17
Note 17
Note 17
Note 17