Despatch Protocol 3 Modbus Communications - Manual (Page 22)

A BOUT T HIS M ANUAL Modbus Programming Manual
22 Version 2
Copyright © 2012 by Despatch Industries.
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2.4. Control Parameters
Parameter Name Modbus
Address
(Dec) Modbus
Address
(Hex) Access
R/W Notes
Cycle time 4301 0x10CD R/W 0.5 to 512.0
Control Type 4310 0x10D6 R/W 0 = Single (Heat Only)
1 = Dual (Heat/Cool)
(Only available on Heat Cool Variant)
Control Action 4311 0x10D7 R/W 0 = Direct
1 = Reverse
Proportional Band 1 4312 0x10D8 R/W 0.0 to 999.9
Secondary (Cool)
Proportional Band 4313 0x10D9 R/W 0.0 to 999.9
(Only available on Heat Cool Variant)
Integral/Reset 4314 0x10DA R/W 0.0 to 5999
Derivative/Rate 4315 0x10DB R/W 0.0 to 5999
Bias 4316 0x10DC R/W For single control 0 to 100, for Duel control -100
to 100
Overlap/DeadBand 4317 0x10DD R/W 20% of the proportional band
(Only available on Heat Cool Variant)
On/Off Differential 4320 0x10E0 R/W 0.1 to 100
Heat/Primary Power
Upper limit 4321 0x10E1 R/W 10 to 100% Can not be made smaller than
Heat/Primary Lower limit + 10
Heat/Primary Power
Lower limit 4322 0x10E2 R/W 0 to 90% Can not be made larger than
Heat/Primary Upper limit
– 10
Cool/Secondary
Power Upper limit 4323 0x10E3 R/W 10 to 100% Can not be made smaller than
Cool/Secondary Lower limit + 10
Cool/Secondary
Power Lower limit 4324 0x10E4 R/W 0 to 90% Can not be made larger than
Cool/Secondary Upper limit
– 10
Pretune Enable 4325 0x10E5 R/W 0 = Disabled
1 = Enabled
Self tune Enable 4326 0x10E6 R/W 0 = Disabled
1 = Enabled
Loop Alarm Type 4327 0x10E7 R/W 1 = Time
2 = Auto
Loop Alarm time 4328 0x10E8 R/W 1 to 5999
Primary Power 4329 0x10E9 R 0 to 100%
Pretune Status 4332 0x10EC R 0 = Inactive
1 = Active
Self tune Status 4333 0x10ED R 0 = Inactive
1 = Active
Loop Alarm status 4334 0x10EE R 0 = Inactive
1 = Active
Preset Power 4335 0x10EF R/W 0% to 100%