SmartAlarm Instruction Manual Rev 2
Page 103 of 115
Multiple Write Request
RTU
START
ADDRESS
FUNCTION
REGISTER /
COIL
ADDRESS
QTY
BYTE
COUNT
DATA
ERROR
CHECK
STOP
ELAPSED
TIME 3 ½
CHARS
MIN
Y
Y
YY
YY
Y
YY
YY
ELAPSED
TIME 3 ½
CHARS MIN
Multiple Write Response
RTU
START
ADDRESS
FUNCTION
REGISTER /
COIL
ADDRESS
QTY
ERROR
CHECK
STOP
ELAPSED
TIME 3 ½
CHARS
MIN
Y
Y
YY
YY
YY
ELAPSED
TIME 3 ½
CHARS MIN
Address
Each alarm card is addressed directly. On a typical 24Way SmartAlarm, first
alarm card data is accessed using node address 1, second alarm card using
node address 2 etc. As default the first node address starts at 1, this can be
modified using the configuration software. Select View - Advanced then
Comms tab and adjust the field marked
“Comms Address Offset”.
First card Node Address
= 1 + Comms Address Offset.
Second card Node Address
= 2 + Comms Address Offset.
Third card Node Address
= 3 + Comms Address Offset.
Comms Address Offset default is 0.
Function
Modbus Function No.
Error Check
This defines the error checking format required, for Modbus RTU this should
be set to CRC (Cyclic Redundancy Check)
