Eurotherm Drives 590 DRV Digital, Product Manual, Page: 224 / 318

Appendix H RS422 Communications (Ports P1 & P2)
590 DRV Digital DC Drive Product Manual App. H - 16
H
NEW SERIAL LINK FEATURES
1. There are more PNO numbers available.
2. Serial port P1 (isolated RS422/-485) supports even (default) or odd parity.
3. The new serial link PNO numbers include some dedicated parameters, similar to those already present in
previous versions of software, and also 16 configurable parameters. The 16 configurable parameters have
PNO’s 112 to 127 (ASCII mnemonics 70 to 7F). These can be made to point to any TAG number, either via the
MMI under SERIAL LINKS::PNO CONFIG, or via the serial link. PNO’s 96 to 111 (ASCII mnemonics 60 to
6F) are pointers associated with PNO’s 112 to 127.
For example:
If PNO 96 = 123, then PNO 112 will access TAG number 123.
If PNO 100 = 234, then PNO 116 will access TAG number 234
List of PNO Assignments
Block 0
PNO Access Description
0 R/O Instrument Identifier. Same as ASCII mnemonic II.
1 R/W Error report. Same as ASCII mnemonic EE. Writing any value resets this PNO to its
default (decimal 192).
2 Reserved
3 Reserved
4 R/W Change band. In an inquiry poll or pseudo-inquiry poll (see PNO 7), a value must have
changed by an amount equal to or greater than the change band before it will be
reported. Change band is measured in the smallest units applicable to each parameter.
For example, if CHANGEBAND = 10, then a parameter with one decimal point must
change by 1.0, and a parameter with two decimal points must change by 0.10 before
they will be reported.
5 R/O Serial link configuration.
Bit nos. Description
0 - 3 0 = 300
1 = 600
2 = 1200
3 = 2400
4 = 4800
5 = 9600 (default)
6 = 19200
4 - 15 Reserved
6 Reserved
7 R/W Control word for multiparameter polling. For the purpose of multiparameter polling,
the PNOs are arranged in 16 blocks of 8. Bit 0 of this parameter controls block 0
(PNO 0 to 7), bit 1 controls block 1 (PNO 8 to 15) .... bit 15 controls block 15 (PNO 120 to
127).
When a bit is 1 (default), a multiparameter poll on this block operates normally, as
defined in the Types of Messages section.
When a bit is 0, a multiparameter poll on this block, with PNO = multiple of 8, and
CNO = 8, performs an inquiry poll instead (a pseudo-inquiry poll).