Red Lion PXU - Manual (Page 20)

20
serial COmmuniCaTiOns
When using a PXU with RS485 communications option, the PXU will support Modbus communications. Unit configuration,
as well as data interrogation, can be accomplished through Modbus communications. The PXU allows for 32 Read / Write
registers. A complete list of Modbus registers is available at the end of this document.
CRIMSON SOFTWARE
Crimson is a Windows ® based program that allows configuration of the PXU
controller from a PC. Crimson offers standard drop-down menu commands to
make it easy to program the PXU controller, the PXU database can then be
saved in a PC file for future use. The Crimson 2.0 software is available at www.
redlion.net. An RS-485 PC card or USB to RS485 converter and cabling is
required. Prior to downloading or extracting the database, the PXU must be set
to Modbus RTU communications type. The proper communications port, baud
rate, and unit address must be configured in the Link, Options dialog and must
match the baud rate and unit address configured in the PXU serial communications
module (
7-SC
).
PXU CONFIGURATION USING CRIMSON
1. Install Crimson software, available for download at www.redlion.net.
2. Connect communications cable from PXU to PC.
3. Supply power to PXU.
4. Configure serial parameters as Modbus RTU (rtu), 38,400 baud, address
247.
5. Create a new file (File, New) or open an existing PXU database within
Crimson.
6. Configure Crimson 2 Link options (Link, Options) to the serial port which the
communication cable is attached (in step 2).
7. Select Update (Link, Update).
PXU FREQUENTLY USED MODBUS REGISTERS
Only frequently used registers are shown below. The entire Modbus Register Table can be found at the end of this document.
REGISTER
ADDRESS
REGISTER NAME LOW LIMIT HIGH LIMIT
FACTORY
SETTING
ACCESS COMMENTS
FREQUENTLY USED REGISTERS
40001 Process Value (PV) N/A N/A N/A Read 1 = 1 Display unit
40002 Active Setpoint (SP) -999 9999 0 Read/Write 1 = 1 Display unit
40003 Setpoint 1 (SP1) -999 9999 0 Read/Write 1 = 1 Display unit
40004 Setpoint 2 (SP2) -999 9999 0 Read/Write 1 = 1 Display unit
40005 Setpoint Deviation N/A N/A N/A Read Only 1 = 1 Display unit
40006 Alarm 1 Value -999 9999 100 Read/Write 1 = 1 Display unit
40007 Alarm 2 Value -999 9999 200 Read/Write 1 = 1 Display unit
40008 Alarm 3 Value -999 9999 300 Read/Write 1 = 1 Display unit
40009 Output Power 1 0 1000 0 Read/Write 1 = 0.1%; writable when in manual mode only.
40010 Output Power 2 0 1000 0 Read/Write 1 = 0.1%; writable when in manual mode only.
40011 PB Proportional band (Active) 1
999(.9)° or
9999 (process)
70 Read/Write 1 = 1 Display unit
40012 Integral time (Active) 0 9999 120 Read/Write 1 = 1 second
40013 Derivative time (Active) 0 9999 30 Read/Write 1 = 1 second
40014 Integration default (Active) 0 1000 0 Read/Write 1 = 0.1 % output power
40015 PID parameter set selection 0 1 0 Read/Write 0 = PID Set 1, 1 = PID Set 2
40016 Auto-Tune Start 0 1 0 Read/Write 0 = No; 1 = Yes
40017 Control Mode Transfer (Auto/Manual) 0 1 0 Read/Write 0 = Automatic (PID), 1 = User (Manual Mode)
40018 Controller Status 0 1 1 Read/Write 0: Stop, 1: Run
40019 Setpoint Select 0 1 0 Read/Write 0=SP1, 1=SP2
40020 SP Ramp Rate 0 9999 0 Read/Write 1 = 1 Display unit/minute
40021 LED Status N/A N/A N/A Read Only b0: ALM3, b1: ALM2, b2: F, b3: C, b4: ALM1, b5: OUT2,
b6:OUT1, b7: AT
40022 Pushbutton Status N/A N/A N/A Read Only b1: F2, b2: Down, b3: P, b5: F1, b6: Up, b7: D; 0 = Key
pressed, 1 = Key not pressed
40023 Alarm Reset 0 7 0 Write b0: Reset Alm1, b1: Reset Alm2, b3: Reset Alm3
40024 Setpoint Ramping Disable 0 1 0 Read/Write 0 = Enabled, 1 = Disabled
40025 Integral Action Disable 0 1 0 Read/Write 0 = Enabled, 1 = Disabled