S&P CAD-REG Manual página 38

Device ID Registration
• Register 0: 143 [read only].
− The controller always responds 143 as a 16-bit binary sentinel point.
EN
Read / write registers
• Register 1: Communications address [read/write].
− The value that is sent is the value of the address (1 to 240) in 16-bit binary.
Default value: 1 [1].
If the controller is connected to a serial communications network, it is not possible to confi gure any unit on the ne-
twork in address 245, since the regulator also reply to that address.
BROADCAST ADDRESS: Address 250 (the controller receives the communication, but does not reply). All registersof
writing are broadcast.
• Register 2: Operating status on/off [read/write].
− 0: Off (OL) / 1: On.
Default value: 0 [0ff].
=240 (0xF0): Default values.
=255 (0xFF): Reset.
• Register 3: Operating mode [read/write].
− 0: Off / 1: Auto / 2: On.
Default value: 1 [Auto].
Cold mode operation (Bypass):
Bypass output
Register 27 (bit 8)
The regulator allows you to perform the bypass operation manually or automatically, being able to select between:
- OFF: Forces the manual closing of bypass
- ON: Forces the manual opening of bypass
- AUTO: Automatic operation. In this case the opening of the bypass is done when they occur simultaneously the
following conditions:
Condition 1
Condition 2
Condition 3
• Register 4: Temperature setpoint [read/write].
− The value sent is the value of the temperature setpoint (3ºC to 30ºC) in 16-bit binary.
Default value: 23 [23 ° C]. [Register 5 ≤ Register 4 ≤ Register 6).
• Register 5: Minimum temperature setpoint [read/write].
− The value sent is the value of the minimum temperature setpoint (3ºC to 30ºC) in 16-bit binary.
Default value: 3 [3 ° C]. [Register 5 ≤ Register 4 ≤ Register 6).
• Register 6: Maximum temperature setpoint [read/write].
− The value sent is the maximum temperature setpoint (3ºC to 30ºC) in 16-bit binary.
Default value: 30 [30 ° C]. [Register 5 ≤ Register 4 ≤ Register 6).
• Register 7: Hysteresis setpoint [read/write].
− The value sent is the hysteresis value (0.5ºC to 3.0ºC) multiplied by 10 in 16-bit binary.
Default value: 10 [1.0 ° C].
38
Bypass output
Register 27 (bit 8)
Off mode
Temperature setpoint < Indoor temperature (cold demand)
Outside temperature < Inside temperature & Inside temperature - Outside temperature >
Differential for free-cooling (demand for free-cooling)
Outside temperature > Minimum outside temperature
Condiciones
favorables
Condiciones
NO favorables
Auto mode (Bypass Auto, Free-cooling )
Operating mode (Bypass)
Bypass output
Register 27 (bit 8)
On mode