Do not paint controller assembly. Do not operate the PROTECTOR P32M if its enclosure is damaged or cracked or has missing components. Make sure the cover, internal PCB’s and field wiring are securely in place before applying power.
Protector P32M User’s Manual, Revision 1.0 2 OVERVIEW The GDS Corp PROTECTOR P32M System Controller is designed to provide power for and monitor signals from up to 32 wired gas monitors using the MODBUS protocol over a two-wire RS-485 serial communications link.
3 INSTALLATION DC POWER INPUT CONNECTION The PROTECTOR P32M is designed to operate on a clean source of +12VDC to +30VDC. Voltage spikes above +30V or below +12V can permanently damage the unit. When using a DC source, connect the (+) and (-) wiring to the Main Terminal Board as shown below.
Protector P32M User’s Manual, Revision 1.0 AC POWER INPUT CONNECTION The PROTECTOR P32M can be ordered with an internal AC power supply as shown below. In this case, a source of 110VAC or 220VAC (50/60 Hz) should be connected to the power supply as shown below.
Protector P32M User’s Manual, Revision 1.0 CONNECTING MODBUS SENSORS The PROTECTOR P32M is designed to work with gas detectors and gas monitors that communicate via MODBUS RTU protocol using RS-485 serial balanced multipoint signaling. For maximum communications reliability, MODBUS sensors must be wired in a ‘daisy-chain’...
As a result, data on bus will be corrupted and a communications error will occur. RECOMMENDED MODBUS SENSOR CONNECTION Since both power and signal must pass through each sensor, GDS Corp recommends the installation of a MODBUS WIRING JUNCTION BOX (MJB). This junction box is attached to the gas detector and provides convenient wiring terminals for incoming and outgoing wiring.
The PROTECTOR P32M includes a single non-isolated RS-485 serial MODBUS output port. This port allows a remote MODBUS master to query the PROTECTOR P32M to retrieve gas levels, alarm conditions and other data. See SPECIFICATIONS for serial port configuration and MODBUS REGISTERS for more detail on data available over MODBUS.
Protector P32M User’s Manual, Revision 1.0 ALARM RELAYS The PROTECTOR P32M has four dry-contact SPDT relays that can be used to control external lights, horns, or other warning devices. Each relay has a COMMON, NORMALLY OPEN and NORMALLY CLOSED contact. When the relay is NOT energized, a connection exists between COMMON and NORMALLY CLOSED.
Protector P32M User’s Manual, Revision 1.0 FAULT RELAY The PROTECTOR P32M has a single wet-contact FAULT output that can be used to drive an external fault indicator light. The output DC voltage will be determined by the type of input power.
4 PROGRAMMING & SETUP DEVICE PROGRAMMING After installation, the PROTECTOR P32M system controller must be programmed to support connected sensors and other devices. Each channel MUST be programmed using the CHANNEL CONFIGURATION MENU, and global settings for the entire controller (for example, fault indication and MODBUS address) may be programmed using the Advanced Configuration Menu detailed later in this chapter.
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Protector P32M User’s Manual, Revision 1.0 Press ADD or SUB to adjust the relay for Alarm HIGH or Alarm LOW status Alarm High = “Alarm is activated when reading RISES” above setpoint Press MENU to move to the next screen.
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Protector P32M User’s Manual, Revision 1.0 Press ADD (Yes) or SUB (No) to set the controller back to Factory Default settings. Channels 1-32: ON Relays levels: 10, 15, 20, 25 Relay mode: Unlatch, High MODBUS output baud rate: 9600 MODBUS output address: 1...
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Protector P32M User’s Manual, Revision 1.0 Press ADD (Increase) or SUB (Decrease) to set the MODBUS ID (address) Press MENU to move to the next screen. Press ADD (Increase) or SUB (Decrease) to set the MODBUS baud rate (4800, 9600, 19200)
Protector P32M User’s Manual, Revision 1.0 5 OPERATION CHANNEL DISPLAY During normal operation, the display scans through each of the 32 channels, displaying two at a time. Pressing the SCAN / HOLD button will stop the scan and hold the current display. Pressing the SCAN / HOLD button again will restart the scan.
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Protector P32M User’s Manual, Revision 1.0 LED INDICATORS ALARM1 No Relay 1 alarm since last power-on Solid RED Relay 1 alarm currently active Blinking RED Relay 1 alarm occurred, but alarm condition no longer exists ALARM2 No Relay 2 alarm since last power-on...
Default = 9600 Data Bits Parity None Stop Bits Timeout 1000 milliseconds Data Register Type Holding Registers SELECTED MODBUS REGISTERS (Contact GDS Corp for more information) Data Length Type Notes Channel 1 Reading Float Any valid float Channel 2 Reading...
Protector P32M User’s Manual, Revision 1.0 7 TROUBLESHOOTING GUIDE DEVICE INOPERATIVE • No power Incorrect power source (AC or DC) • • Internal power switch turned OFF INCORRECT / NO READING ON CONTROLLER Data corruption: Duplicate addresses: Verify that each device has a UNIQUE address •...
Protector P32M User’s Manual, Revision 1.0 8 SPECIFICATIONS Power Input* 110/220VAC or +12 to +35VDC (Specify AC or DC when ordering) Input Type RS-485 serial MODBUS master controller Surge suppression on MODBUS master Number of Inputs Up to 32 channels...
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