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INM MTL SUM5 Rev 7
DRAFT - 09 June 2021 DRAFT - 09 June 2021
33.5 Write Multiple Coils – Function 15 - Read Request – Master
Coil Address
Indicates rst coil address to be written. Typically the rst channel contact status on an alarm card
“channel 1” would be coil address 00 01.
To write the contact status coils use address range 1- 8.
Note: To initiate input status change via message 15 “Input via serial comms” must be selected for
each channel. Selection is via the conguration software.
Quantity
This represents the number of coils (Channels) the master wishes to write
Byte Count
This represents the number of data bytes sent
Data
This represents the status of the coil to be written
0 = Contact Normal
1 = Contact Abnormal
33.6 Write Multiple Coils – Function 15 – Read Response - Slave
Coil Address
Indicates rst coil address to be written. Typically the rst channel contact status on an alarm card
“channel 1” would be coil address 00 01.
Quantity
This represents the number of coils the master has written
Typical Example of Message Format
To write alternate contacts abnormal on a 32 way SmartAlarm where each alarm card is treated as an
individual node. The following message format would have to be repeated 3 x times, once for each
card node address.
RTU
ADDRESS FUNCTION REGISTER
ADDRESS
No Of
REGISTERS
BYTE
COUNT
DATA ERROR
CHECK
01 0F 00 01 00 08 01 AA 43 2A
Example shows message for rst card, Comms address offset 0.
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