Modbus Rtu (Optional); Table 13 - Spi Parameters - Conair EP2 series User Manual

Table 13 - SPI Parameters

Command
Echo
Version
Setpoint Process
Temperature
Alarm, High Temperature
Deviation
Alarm, Low Temperature
Deviation
Status, Process
Status, Machine 1
Status, Machine 2
Mode, Machine
Temperature, To Process
(Supply)
Temperature, To Process
(Return)

Modbus RTU (Optional)

This option provides a RS-485 communications port for Modbus RTU communications. See Table 11 for details on
how to enable this feature. Note the ModBus Parity = None, Stop Bits = 1, and default Baud Rate = 9,600.
Table 14 – Standard Controller Modbus RTU Option Parameters
Register
4002 Machine State
4007 Derivative
4008 Integral
Poll Select
This is the controller integrity command used to accept and retain data and provide it
20 20
20 21
in response to a poll inquiry. This is an open 4-byte ASCII format with ASCII units.
This is the controller version command used to provide a version number following
20 22
format: AABB, where AA = SPI assigned version level, BB = vendor assigned version
level. This is in an open 4-byte ASCII format with ASCII units.
This is the temperature target for the supply coolant leaving the chiller. This is a
20 30 20 31
numeric format in °F.
This is the value in conjunction with the process setpoint that determines the high
20 32 20 33
alarm temperature. This value must always be positive. This is a numeric format in °F.
This is the value in conjunction with the process setpoint that determines the low alarm
20 34 20 35
temperature. This value must always be positive. This is a numeric format in °F.
This is the process status in a 16 bit format as follows:
20 40
0 = Controlling
1 = An alarm is present
2 = An alarm affecting the process has occurred (high or low temperature deviation)
3 = An alarm affecting the machine has occurred (probe fault or pump fault)
4 = The controller has exceeded its over setpoint deviation
5 = The controller has exceeded its below setpoint deviation
This is the machine status in a 16 bit format as follows:
20 42
0 = Controlling
1 = An alarm is present
2 = An alarm affecting the process has occurred (high or low temperature deviation)
3 = An alarm affecting the machine operation has occurred (probe fault or pump fault)
4 = The controller has exceeded its over setpoint deviation
5 = The controller has exceeded its below setpoint deviation
This is the machine status in a 16 bit format as follows:
20 44
0 = Controlling
1 = An alarm is present
2 = An alarm affecting the process has occurred (high or low temperature deviation)
3 = A sensor error has been detected
4 = An alarm affecting the machine operation has occurred
This is the machine mode in two 8-bit bytes. When polling 20 48 bit 0 indicates the
20 48 20 40
machine is off. 20 40 bit 0 commands the unit to be turned on or off (on when high or
off when low), 20 40 bit 1 is used to recognized the alarm condition
Returns the process supply temperature.
20 70
This is a numeric format in °F.
Returns the process return temperature.
20 72
This is a numeric format in °F.
Description Read/Write Format
Integer
R
R/W Integer
R/W Integer
18
Description
Notes
0 = Off, 1 = Stop, 2 = Run, 3 = Run Fault 2,
4 = Run Fault 3, 5 = Fault 1, 6 = Factory Menu,
7 = User Menu, 8 = Get User Password,
9 = Master Reset