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Johnson Systems Inc.

J-PACK Series • Hi-Power Relay Pack


1.1 J-PACK Relay Packs shall be capable of switching multiple independent general purpose lighting loads including LED and tungsten up to 20 Amps. Each relay shall be protected by a premium hydraulic magnetic breaker of the appropriate voltage rating for the model. Full rated operation shall be permitted without compromising product life expectancy.

1.2 J-PACK Relay Packs shall be powered by a range of supply options depending on the model, thereby permitting industry wide power supply compatibility.

1.3 J-PACK Relay Packs shall contain LCD user interface for ease of set up and monitoring. All programming shall be via a user-friendly, intuitive and self-prompting menu structure. No PC or special software is required.

1.4 DMX512 data start address shall be addressable in single channel (offset) or individually (patch) on a per circuit/relay basis. It shall be possible to address any relay to any channel within the entire DMX512 universe.

1.5 Dedicated DMX IN and DMX THRU ports shall be supplied internally via 3 pin break-away connectors, as well as externally, via 5-PIN XLR connectors.

1.6 Programmable DMX status hold shall permit the last DMX input levels to be held on loss of DMX data for a range of 0-99 minutes in one second increments or infinite.

1.7 J-PACK Relay Packs shall permit automatic positive or negative chase sequencing for special effects applications. The time between relay state changes shall be adjustable from 0.1 to 9.9 seconds. This chase sequence shall be triggered from an assignable dry contact input.

1.8 Two auxiliary contacts inputs shall be supplied internally, as well as externally, via 3-PIN XLR connector. Two "patches", A and B, will permit a predetermined group of relays to activate simultaneously. Dry-contact input triggers shall enable these stored "scenes" for automation with other AV control equipment. It shall also be possible to program the relay status (open or closed) for "load shedding" applications when interfaced to photocell, aux. sensor or BMS for power management applications.

1.9 In addition to over current protection, internal thermal protection shall also be provided in the CPU. An active over-temp input shall illuminate a red warning LED when an internal temperature of 85C is measured. An internal temperature of 85C shall immediately disconnect (open) all relay outputs and cause the red error LED on the J-PACK face panel to illuminate.


2.1 J-PACK Relay Packs shall employ the "system-on-a-chip" advanced "3000 Series" digital technology. The control electronics shall be contained on the DMX Relay Driver (DRD-6) and it's associated User Interface Board (UIB).

2.2 The DRD-6 will operate with a voltage input range of 90-300VAC at 50Hz or 60Hz, thereby permitting global application.

2.3 J-PACK Relay Packs shall be capable of memorizing and storing two separate "patches". These "patches" shall be easily programmed via the keypad. Scene playback shall be activated by dry-contact closure of either of the two provided auxiliary contact.

2.4 The DMX input shall comply with USITT DMX512-A (ANSI E1.11 - 2008) standard protocol for digital data control. DMX data shall take priority over an active auxiliary contact input. Load shed activation shall take priority over all other inputs.

2.5 Compliance with the International Energy Agency's "One Watt Initiative" standby power requirement. Please refer to U.S. Executive Order #13221. Processor standby power on J-PACK Relay Packs shall not exceed 1 Watt.

2.6 J-PACK Relay Packs shall allow "back up" of all system configuration data. All data shall be protected from power failure by EEROM for a minimum of 100 years.

2.7 All relays shall have a fixed/default "Pulse OFF" threshold of 48% control and a fixed "Pulse ON" threshold of 52%. The resulting 4% hysteresis difference shall ensure no false triggering or "cycling" of the relays. Each relay shall have an adjustable trigger level from 2% to 98% DMX with a 2% hysteresis.

2.8 The J-PACK Relay Pack face panel shall include an LCD display and momentary, self-illuminating push buttons for function select, parameter setting and feature monitoring. All programming shall be via a user-friendly, intuitive and self-prompting menu structure. It shall not be necessary to use a PC or any external programming devise to configure or set-up any function of the J-PACK.

2.9 J-PACK Relay Packs shall support the following menu items:

Basic Menus

1. ADDRESS Set the DMX start address.

2. DMX TRM Enable or disable the DMX termination.

Advanced Menus

3. RLY TEST Test the relay outputs one at a time, or all at once.

4. DMX O/P Configure the on-board DMX protocol manager for offset or patch mode.

5. DMX PAT Patch each of the 6 relay outputs to any DMX input channel.

6. SH TIME Set the DMX status hold time from 0 to 99 minutes or infinite.

7. TRIGGER LEVEL Set the DMX trigger level threshold for each relay.

8. EFFECTS Activate effects mode and configure a pattern effect with selectable time.

9. AUX TEST Test the auxiliary dry-contact inputs.

10. AUX1MODE Set the auxiliary input 1 mode to trigger relays on, load shed or activate effects.

11. AUX2MODE Set the auxiliary input 2 mode to trigger relays on, load shed or activate effects.

12. AUX PAT Patch the auxiliary inputs to any combination of relay outputs.

13. VOLT SEL Select the relay output circuit operating voltage.

14. CTL TEMP View the temperature of the microprocessor.

15. HARD-KEY View the microprocessor's unique eight-character hard-key code.

16. SERIAL# View the microprocessor's unique eight-character silicone serial number.

17. FIRMWARE View the microprocessor's firmware version.

18. DEFAULTS Set various system configuration settings to the factory default.

19. RLY INT Set the intensity of the relay output status LED's.

20. LED INT Set the intensity of the programming switch LED's.

21. LCD VIEW Adjust the contrast of the LCD Display for optimum viewing.

2.10 J-PACK Relay Pack face panels shall include a green LED indicator for power supply and microprocessor status. The LED, when illuminated, shall indicate normal operation and when flashing, shall indicate a hardware fault. A power supply or power failure shall cause the LED to extinguish.

2.11 J-PACK Relay Pack face panels shall include a yellow LED for DMX data (RxD) end-of-line termination indication. Active end-of-line termination shall cause the LED to illuminate.

2.12 J-PACK Relay Packs face panels shall include one red ERROR LED for active alarm status or dimmer pack over temperature. An active error condition shall cause the LED to illuminate.

2.13 J-PACK Relay Packs face panels shall include six blue relay LED's, one per relay. A ON control signal to any given relay shall cause the corresponding LED to illuminate.

2.14 A reset push-button shall be included on the face panel of the J-PACK's. Resetting the unit, whether by the reset button or power-up, shall not affect any stored parameters or presets, and dimmer outputs shall automatically return to their former status.

2.14 All face panel buttons shall be blue LED back-lit with adjustable intensity.

2.15 All printed circuit boards (PBC's) shall be FR4/G10 with a UL 94V-0 Flame Class Rating.

2.16 J-PACK Relay Packs are ETL listed and comply fully with UL 508 and CSA 22.2 safety approvals.

Specifications subject to change without notice.