HTP 7350P-629 - Manual (Page 11)

11
FUNCTION SUB FUNCTION HEX DESCRIPTION
DEC HEX DEC
17 11 Diagnostic – Return follower busy count
18 12 Diagnostic – Return bus character overrun count
20 14 Diagnostic – Clear overrun counter and flag
11 0B Get communication event counter
12 0C Get communication event log
15 0F Write multiple coils
16 10 Write multiple registers
17 11 Report follower ID
22 Mask write register
23 17 Write multiple registers
24 Read FIFO Queue
Table 7 – Modbus function set
E. MODBUS EXCEPTION CODES
CODE NAME MEANING
01 ILLEGAL FUNCTION
This code is received when an illegal action is entered into the building management
system. This may be because the function code is only applicable to newer devices,
or the follower device is in the wrong state to process a request of this type.
02 ILLEGAL DATA ADDRESS
This code is received when an illegal data address is entered into the building
management system. More specifically, the combination of reference number and
transfer length is invalid.
03 ILLEGAL DATA VALUE
This code indicates that an illegal value has been entered into the building
management system.
04 FOLLOWER DEVICE FAILURE An error occurred while the follower was attempting to perform the requested action.
05 ACKNOWLEDGE
Indicates that the server (or follower) has accepted the request, but will take a
significant amount of time to process it. This response prevents a timeout error.
06 FOLLOWER DEVICE BUSY
This is received when a follower device is busy processing a programmed command.
User should query this device at a later time.
08 MEMORY PARITY ERROR
The server (or follower) attempted to read a file, but detected a parity error in the
memory. The user can retry the request, but service may be necessary to fix this
error.
0A GATEWAY PATH UNAVAILABLE
Indicates that the gateway was unable to allocate an internal communication path
from the input port to the output port.
0B
GATEWAY TARGET DEVICE
FAILED TO RESPOND
Specialized use in conjunction with gateways - indicates that no response was
obtained from the target device. Usually means that the device is not present on the
network.
Table 8 – Modbus exception codes
PART 6 - REGISTER MAP
A. PRIMARY DATA TABLES
TABLE DATA TYPE READ/WRITE DESCRIPTION
Discrete Inputs Single bit Read only Data can be provided by an I/O system.
Coils Single bit Read / Write Data can be altered by an application program.
Input Registers 16-bit word Read only Data can be provided by an I/O system.
Holding Registers 16-bit word Read / Write Data can be altered by an application program.
Table 9 – Supplementary information
B. APPLIANCE MEMORY MAP
ADDRESS DESCRIPTION DEFAULT UNIT MIN MAX RESOLUTION
COILS
00001
Appliance enable / Room
thermostat / Stage 1
0 1 = on, 0 = off 0 1 1
00005 Tank thermostat 0 1 = on, 0 = off 0 1 1
00006