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Page 114 MultiRanger 100/200 – INSTRUCTION MANUAL 7ML19981FB05
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Commu
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ion Appendix A
Communication Appendix A: Single
Parameter Access (SPA)
This Appendix is intended to provide someone with advanced communications
knowledge the ability to access any parameter value in any available format.
Built into MultiRanger is an advanced handshaking area that can be used to read and
write single registers to the MultiRanger. This section performs a similar function to the
Parameter access section. The differences are:
1. Advanced section is more powerful and harder to program.
2. Advanced section only gives you access to one parameter at a time.
Mapping
Parameter Read and Write (40,090 – 40,097) is a series of eight registers used for reading
and writing parameter values to and from the MultiRanger. The first three registers are
always unsigned integers representing parameters and index values. The second five
registers are the format and value(s) of the parameter.
All parameters normally accessed through the hand-held programmer are available
through these registers.
Reading Parameters
To read parameters through Modbus do the following steps:
1. Send the parameter, its primary index, and its secondary index (usually 0), and
format to registers 40,090 to 40,093.
2. Wait until you can read the written values from the registers (40,090 to 40,093) to
confirm that the operation is complete.
3. Read the value from registers 40,094 and 40,095.
Address Description
40,090 Parameter (integer)
40,091 Primary Index (integer)
40,092 Secondary Index (integer)
40,093 Format word (bit mapped)
40,094 Read value, word 1
40,095 Read value, word 2
40,096 Write value, word 1
40,097 Write value, word 2