Det-Tronics PIRECL Infrared Carbon Dioxide Gas Detector PointWatch Eclipse - Manual (Page 43)

f-2 95-8676 2.1
harDWare layer
RS-485 is used for the hardware interface layer. The output drivers are capable of driving at least 32 devices. The
device RS-485 output is tri-stated until a command address matches the programmed address. Default serial settings
are MODBUS protocol, address 1, 9600 baud, 1 stop bit, and no parity.
MoDbUS fUnCTIon CoDeS
MeMory Map
eClIpSe MeMory Map
factory Constants
This area holds values determined at the time of manufacture. Device type and firmware version is determined when
the program is compiled and can’t be changed. The serial number and manufacture date is written as part of the
manufacturing process.
Supported Modbus functions
function number Definition
3 Read holding registers
6 Preset single registers
16 Preset multiple registers
Description Starting address ending address Size in Words access Memory Type
Factory Constants 40001 40100 100 Read/Write at Factory Flash/EEprom
Device Configuration 40101 40200 100 Read/Write EEprom
Status Information 40201 40300 100 Read Only Ram
Control Words 40301 40400 100 Write Only Pseudo RAM
Event Logs 40401 40430 30 Read Only EEprom
Calibration Logs 40431 40460 30 Read Only EEprom
Raw Signal Buffer 40500 40979 480 Read Only Ram
eclipse factory Constants
Description address Value
Device Type 40001 3 (Eclipse)
Firmware Version 40003 00.00..99.99
Serial Number
40004
40005
Unsigned Long LSW
Unsigned Long MSW
Year (Manufacture Date) 40006 1999
Month 40007 1..12
Day 40008 1..31
Reserved
40009
to
40010