100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
HA029324
Issue 11 Oct 14
User Guide
Page 301
8.4.5 Feature identi
fi
cation table (FIT)
This table allows the host to identify which features are available at the recorder.
Parameter name
Description
Value
Access
Start Addr
Hex (Dec)
Register
Length
Number of features
Number of supported features
3
Read only
CC26 (52262)
1
Feature 1
Indirection Table
1
Read only
CC27 (52263)
1
Read only indirection table start address (R/O vector)
CD89
Read only
CC28 (52264)
1
Read/Write indirection table start address (R/W vector)
D18A
Read only
CC29 (52265)
1
Spare
CC2A (52266)
1
Feature 2
Function codes supported (FC I.D.)
4
Read only
CC2B (52267)
1
Bit map of supported MODBUS function codes
32940
Read only
CC2C (52268)
1
Bit 0: 0 = code 1 not supported; 1 = code 1 supported
Bit 1: 0 = code 2 not supported; 1 = code 2 supported
Bit 2: 0 = code 3 not supported; 1 = code 3 supported
Bit 3: 0 = code 4 not supported; 1 = code 4 supported
Etc.
Bit 15: 0 = code 16 not supported; 1 = code 16 supported
Reserved
CC2D
(52269)
1
Reserved
CC2E
(52270)
1
Feature 3
Security ID (MODBUS login security feature)
9
Read only
CC2F (52271)
1
User name
Write only
CC30
(52272) 40
Password
Write
only
CC58
(52312) 40
Reserved
CC80
(52352) 1
Feature N
100 Spare addresses for further features
CC81 (52353)
100
8.4.6 Indirection tables
The standard MODBUS protocol allows block register reads and writes. This is ef
fi
cient only if data is grouped
contiguously, or nearly so. Indirection tables are a means by which widely spaced register addresses can (in
effect) be grouped, offering the host the ability to access a block of user de
fi
ned data in one single read/write
request.
Two con
fi
gurable tables are available, one for read only parameters, the other for read/write.
Each table is in
two halves - the lower address half contains the addresses of the registers to be accessed; the higher address
half contains the values which have been read or which are to be written.
Notes:
1. For Ethernet connections, indirection table entries are lost at power off, as the result of a brown-
out or if the connection with the host is broken.
2. Parameters in IEEE format can be accessed by con
fi
guring two successive entries in the table. Pa-
rameters which occupy more than one register can be loaded into the indirection area by using
function code 16 (pre-set multiple registers) and the parameter’s base address (i.e. the parameter’s
1st register).
3. Separate indirection table entries are held for each host - the recorder automatically switches each
host to its own indirection table without user intervention.
4. Indirection table addresses (CCE5 to D4E7) cannot be entered in the indirection tables. Any attempt
to do so will be ignored.
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