Bacharach 6702-8000 User manual

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WARRANTY POLICY

Bacharach, Inc. warrants to buyer that at the time of delivery this product will be free from
defects in material and manufacture and will conform substantially to Bacharach, Inc.’s
applicable specifications. Bacharach’s liability and buyer’s remedy under this warranty are
limited to the repair or replacement, at Bacharach’s option, of this product or parts thereof
returned to seller at the factory of manufacture and shown to Bacharach, Inc.’s reasonable
satisfaction to have been defective; provided that written notice of the defect shall have been
given by buyer to Bacharach, Inc. within one (1) year after the date of delivery of this product by
Bacharach, Inc.

Bacharach, Inc. warrants to buyer that it will convey good title to this product. Bacharach’s
liability and buyer’s remedy under this warranty of title are limited to the removal of any title
defects or, at the election of Bacharach, to the replacement of this product or parts thereof that
are defective in title.

THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN
LIEU OF (I) ANY AND ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE: AND (II) ANY OBLIGATION, LIABILITY, RIGHT, CLAIM OR
REMEDY IN CONTRACT OR TORT, WHETHER OR NOT ARISING FROM BACHARACH’S
NEGLIGENCE, ACTUAL OR IMPLIED. The remedies of the buyer shall be limited to those
provided herein to the exclusion of any and all other remedies including, without limitation
incidental or consequential damages. No agreement varying or extending the foregoing
warranties, remedies or this limitation will be binding upon Bacharach, Inc. unless in writing,
signed by a duly authorized officer of Bacharach.

SERVICE POLICY

Bacharach, Inc. maintains a service facility at the factory. Some Bacharach distributors / agents
may also have repair facilities; however, Bacharach assumes no liability for service performed
by anyone other than Bacharach personnel. Repairs are warranted for 90-days after date of
shipment (sensors, pumps, filters and batteries have individual warranties). Should your
analyzer require non-warranty repair, you may contact the distributor from whom it was
purchased.

If Bacharach is to do the repair work, send the monitor, prepaid, to the closest service center.
Prior to shipping equipment to Bacharach, or a Returned Merchandise Authorization Number
(RMA #). All returned goods must be accompanied by a RMA #. Pack the equipment securely
(in its original packing, if possible), as Bacharach cannot be held responsible for any damage
incurred during shipping to our facility. Always include your RMA #, shipping address,
telephone number, contact name, billing information and a description of the defect as you
perceive it. You will be contacted with a cost estimate for

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expected repairs prior to the performance of any service work. For liability reasons, Bacharach
has a policy of performing all needed repairs to restore the monitor to full operating condition.

NOTICES

Product improvements and enhancements are on-going, therefore the specifications and
information contained in this document may change without notice.

Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material.

No part of this document may be photocopied, reproduced, or translated to another language
without the prior written consent of Bacharach, Inc.

Copyright © 2019, Bacharach, Inc., All Rights Reserved.

BACHARACH is a registered trademark of Bacharach, Inc. All other trademarks, trade names, service marks and logos referenced

herein belong to their respective companies.

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Table of Contents

Table of Contents 3

1. Introduction 6

1.1 About this Manual 6

1.2 Conventions 6

1.2.1 Short Form Instructions 6

1.2.2 Iconography 7

1.3 General Safety Statements 7

1.4 Communication Options 8

2. Product Description 9

2.1 Product Overview 9

2.2 Intended Use 10

2.3 Design Features 10

2.4 Components 11

3. Installation 12

3.1 Warnings & Cautions 12

3.2 Preliminary Inspection 13

3.3 Suitable / Appropriate Locations 13

3.4 Mounting the Gas Detection Controller 14

3.5 Electrical Wiring 14

3.6 Communications Connections 15

3.6.1 MGS-408 Gas Detection Controller Network 15

3.6.2 Integration with Building Management System 17

3.7 Connecting External Alarms 17

3.7.1 Overview 17

3.7.2 Connection Procedure 17

4. Operation 18

4.1 Overview 18

4.1.1 Main Function 18

4.1.2 Post 18

4.1.3 Channel number keys 18

4.1.4 Menu access and navigation 18

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4.2 Controller Setup 19

4.2.1 Setup Parameters 19

4.2.2 Relay Setup 19

4.2.3 AV Alarm 20

4.2.4 Fault Latching 20

4.2.5 Bluetooth 21

4.2.6 LCD Contrast 21

4.2.7 LED Brightness & Auto-dimming 21

4.2.8 Date/Time 21

4.2.9 Password Protection 22

4.2.10 Factory Reset 23

4.2.11 Update Firmware 23

4.3 Channel Summary and Setup 24

4.3.1 Channel Setup Overview 24

4.3.2 CHx MON (Monitor) 25

4.3.3 CHx TYP (Instrument Type) 25

4.3.2 CHx ADR (Node Address) 25

4.3.2 CHx LOC (Location) 25

4.4 Data Logging 25

4.4.1 Data Logging Overview 25

4.4.2 SD Card Requirements\ 26

4.4.3 Data Logging Menu 26

4.4.3.1 SD EJECT 27

4.4.3.2 LOGGING (ON/OFF) 27

4.4.3.3 SD %FREE 27

4.4.3.4 SD FAULT (XX) 27

5. MODBUS 28

5.1 MODBUS Overview 28

5.1.1 MASTR BAUD (XXXX) 28

5.1.2 SLAVE NODE (XXX) 28

5.1.3 SLAVE BAUD (XXXX) 28

5.1.4 SLAVE PRTY (XXXX) 28

5.1.5 SLAVE STOP (X) 28

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5.1.6 SLAVE TERM 29

5.2 MODBUS Registers 29

6. Diagnostics and Troubleshooting 35

6.1 Diagnostic Menu 35

6.1.1 CURRENT FAULT 35

6.1.2 LAST FAULT 35

6.1.3 CLEAR FAULT 35

6.1.4 CLEAR LAST FAULT 36

6.1.5 CLR LAST SD FAULT 36

6.1.6 POWER 36

6.1.7 MODBUS SLAVE 36

6.1.8 MODBUS MASTER 36

6.1.9 BLUETOOTH 36

6.2 FAULT CODES 37

6.3 SYSTEM TESTS 38

6.3.1 RELAY TEST 38

6.3.2 LED TEST 38

6.3.3 KEYPAD TEST 38

6.3.4 STROBE TEST 39

6.3.5 FAN TEST 39

7. Additional Information 40

7.1 Disposing of Instrument 40

7.2 Technical Specifications 40

8. Parts & Accessories 41

8.1 Part Numbers 41

8.1.1 MGS-408 Configurations

8.1.2 MGS-400 Series Accessories

41

41

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1. Introduction

IMPORTANT: Before using this product, carefully read and strictly follow the

instructions in the manual. Ensure that all product documentation is retained and
available to anyone operating the instrument.

1.1 About this Manual

Thank you for investing in a Bacharach MGS-408 Gas Detector Controller. To ensure operator
safety and the proper use of the controller, please read the contents of this manual for important
information on the operation and maintenance of the instrument.

1.2 Conventions

1.2.1 Short Form Instructions

This document uses a short form for describing steps (e.g. executing a command).

Example:

Clearing the current fault.

Short Form Instructions:

To clear the current fault: Main Menu > Diagnostics > Clear Fault > press “OK”

Steps Required:

1. Press “OK” to access the Main Menu.

2. Select “Diagnostics.”

3. Select “Clear Fault.”

3. When prompted, press “OK” to clear the current fault.

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1.2.2 Iconography

Danger

Imminently hazardous situation which, if not avoided, will
result in death or serious injury.

Warning

Potentially hazardous situation which, if not avoided, could
result in death or serious injury.

Warning

Potential electrical shock hazard which, if not avoided, could
result in death or serious injury.

Caution

Potentially hazardous situation which, if not avoided, could
result in physical injury or damage to the product or
environment. It may also be used to alert against unsafe
practices.

Important

Additional information on how to use the product.

IMPORTANT: Before using this product, carefully read and strictly follow the

instructions in the manual. Ensure that all product documentation is retained and
available to anyone operating the instrument.

DANGER: This instrument is neither certified nor approved for operation in oxygen-

enriched atmospheres. Failure to comply may result in personal injury or death.

WARNING: Under no circumstances should this product be operated without

connection to a protective ground. Failure to comply may result in a potential shock
hazard and is a violation of electrical safety standards applicable to this category of
equipment.

WARNING: Extreme care should be exercised when accessing the product’s

interior. Only qualified electrical maintenance personnel should perform connections
and adjustments. Always remove AC power before working inside the MGS-408’s

enclosure.

1.3 General Safety Statements

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WARNING: Use a DRY CLOTH to clean the outside of this product. DO NOT use

soap and water or other detergents. Failure to comply may result in a potential
shock hazard.

CAUTION: The protection provided by this product may become impaired if it is

used in a manner not specified by the manufacturer. Modifications to this instrument,
not expressly approved, will void the warranty.

CAUTION: In case of malfunction, DO NOT continue to use this equipment if there

are any symptoms of malfunction or failure. In the case of such occurrence, de­energize the power supply and contact a qualified repair technician or the nearest
Bacharach
Service Center.

CAUTION: Use ONLY the provided cable glands for electrical and communication

wiring. Drilling into the box will void the warranty.

IMPORTANT: This device is designed for operation at or below and altitude of 6,562

ft (2,000 m). Operation above this elevation may impair product performance.

1.4 Communication Options

The MGS-408 Gas Detection Controller features full two-way communications via an RS-485
interface. MODBUS RTU is the communication protocol standard. The controller can be
connected to a Building Management System or it may be operated as a stand-alone system
with Bacharach’s gas monitors.

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2. Product Description

2.1 Product Overview

The MGS-408 Gas Detection Controller displays comprehensive information about the status of
all connected gas detectors. A maximum of 8 Bacharach gas detectors can be connected to the
MGS-408 via Modbus RTU. Compatible gas detectors are:

- MGS-410

- MGS-450

- MGS-460

- MGS-250

- MGS-550

The MGS-408 can be used to provide power to each connected, compatible gas detector,
negating the need for separate power supply at the location of the gas detector.

The MGS-408 displays status via an LCD screen and LEDs. For each connected gas detector,
status is clearly indicated via dedicated LEDs to indicate:

- Power & connectivity

- High alarm

- Low alarm

- Fault

The LCD screen will display the current gas reading and gas type for the selected channel, or
will indicate fault and/or alarm status. The LCD screen is also used for configuration of the
MGS-408 via the integrated keypad.

In addition to the visual alarm status displayed, the MGS-408 includes an integrated audible
alarm. An optional audio-visual alarm beacon can be installed, mounted in the top of the
enclosure, to enhance local alarm indication.

The MGS-408 provides relays (indicating any high alarm, low alarm or fault status) and can act
as a Modbus slave device. This allows connection to a third-party device such as a Building
Management System (BMS) or Programmable Logic Controller (PLC).

Data logging is available on the MGS-408 via the integrated SD card, which can be removed to
allow download of the logged data to a computer.

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WARNING: This instrument is neither certified nor approved for operation in oxygen-

enriched atmospheres. Failure to comply may result in EXPLOSION.

WARNING: This instrument has not been designed to be intrinsically safe for use in

areas classified as being hazardous locations. For your safety, DO NOT use it in
hazardous (classified) locations.

2.2 Intended Use

The MGS-408 is intended to be used to provide audio-visual alerts and information on the status
of a network of gas detectors in a centralized location. This allows clear at-a-glance visualization
of any alarm or fault status on a connected gas detector in a location outside of the monitored
space, as required by many regulatory codes and standards.

2.3 Design Features

Power options:

 100 - 240 VAC, 50/60 Hz, 80W (max.)
 Provides power for 1 - 8 compatible Bacharach gas detectors

Output / Communications:

 RS485 Modbus RTU Master for Gas Detectors
 Diagnostic/status LEDs

o Controller (power; fault)
o Gas detectors (power & connectivity; fault; low alarm; high alarm)

 Optional: integrated high output horn/strobe

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 Configurable output signal options

#

Component Description

1

AC Power Terminal Block

2

Power Supply

3

Cooling Fan

4

SD Card Slot

5

Coin Cell Battery

6

Reset Switch

o 3× relays (universal: high alarm / low alarm / fault)
o RS485 Modbus RTU Slave

Data logging via SD card

User interface:

 LCD display screen
 Integrated keypad

2.4 Components

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7

High Alarm Relay

8

Low Alarm Relay

9

Fault Relay

10

Sensor Power Connector

11

Sensor Data Connector

12

BMS Data Connector

13

AV Beacon Connector (external beacon not shown)

WARNING: Explosion hazard! Do not mount the MGS-408 Gas Detection

Controller in an area that may contain flammable liquids, vapors or aerosols.
Operation of any electrical equipment in such an environment constitutes a safety
hazard.

WARNING: Electrical installation should be performed by a certified electrician, and

should comply with all applicable NEC/CEC and local electrical safety codes.

3. Installation

3.1 Warnings & Cautions

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WARNING: The AC power ground wire must first be connected to the monitor’s

ground terminal. Under no circumstances should this monitor be operated without a
protective ground. Doing so poses a potential shock hazard, and is also a violation
of electrical safety standards applicable to this type of equipment.

WARNING: Shock hazard! Always turn off AC power before working inside the

monitor.

CAUTION: Drilling holes in the MGS-408 Gas Detection Controller enclosure may

damage the unit and will void the warranty. Please use provided cable glands for
electrical connections.

CAUTION: The MGS-408 Gas Detection Controller contains sensitive electronic

components that can be easily damaged. Be careful not to touch or disturb any of
these components.

3.2 Preliminary Inspection

The MGS-408 Gas Detection Controller has been thoroughly inspected and tested prior to
shipment from the factory. Nevertheless, it is recommended that the instrument be re-checked
prior to installation. Inspect the outside of the enclosure to make sure there are no obvious signs
of shipping damage. Loosen the two screws on the top of the enclosure lid and open the front
panel. Visually inspect the interior of the enclosure for loose wires or components that may
have become dislodged during shipment. If damage is discovered, please contact for
assistance.

3.3 Suitable / Appropriate Locations

The MGS-408 Gas Detection Controller should be centrally located in the facility (preferably
outside of the mechanical room) and should be easily accessible for visual monitoring and
servicing. This is the “split architecture design” for safety of the operator.

Dirt, grease, and oils can adversely affect the operation of the MGS-408 Gas Detection
Controller. The MGS-408 Gas Detection Controller should be installed out of direct sunlight in a
clean, dry area that is not subject to temperature or humidity extremes. Installation in a
mechanical room is acceptable provided reasonable environmental conditions exist. If there is a
question, consider installing the unit outside of the mechanical room in a cleaner area of the
facility.

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The MGS-408 Gas Detection Controller can be located up to 4500 feet (1372 m) from the

WARNING: Electrical installation should be performed by a certified electrician,

and should comply with all applicable NEC/CEC and local electrical safety codes.

WARNING: Copper conductors for connection to supply mains must be made in

accordance with NEC/CEC and local codes.

CAUTION: Drilling holes in the MGS-408 Gas Detection Controller enclosure may

damage the unit and will void the warranty. Please use cable glands provided for
electrical connections.

furthest gas monitor when using RS485 communications. The available distance is less when
using the controller as the power supply for downline gas transmitters. The total power available
for gas detectors is 51W. Careful attention to voltage drop over distance with a suitable wire
gauge employed is also required.

The MGS-408 Gas Detection Controller provides an interface by which you can monitor,
acknowledge alarms, and observe conditions inside the mechanical room.

3.4 Mounting the Gas Detection Controller

The MGS-408 Gas Detection Controller should be installed plumb and level and securely
fastened to a rigid mounting surface. The enclosure utilizes four mounting holes designed for #6
(or M3.5 or M4) pan head fasteners (included). Mounting holes are located in the four corners of
the enclosure, accessed by opening the front panel. Install and adjust the screws as necessary
to hold the unit securely against the mounting surface.

3.5 Electrical Wiring

The controller enclosure features M20 two cable glands that are intended for power entry. If
conduit is preferred simply remove one of the M20 glands and install a suitable ½” conduit
adapter.

Locate the AC power and Ground on the power input terminal block. Secure the incoming AC
power neutral (white/blue) and live (black/brown) and ground wires to the appropriate terminals
using a screwdriver on the press to release tabs as shown below.

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NOTE: A certified AC power disconnect or circuit breaker should be mounted near

the controller and installed following applicable local and national codes. If a switch
is used instead of a circuit breaker, a properly rated CERTIFIED fuse or current
limiter is required to be installed as per local or national codes. Markings for

positions of the switch or breaker should state (I) for on and (O) for off.

3.6 Communications Connections

3.6.1 MGS-408 Gas Detection Controller Network

The MGS-408 Gas Detection Controller is connected to MGS400/550/250 gas detectors using a
shielded twisted pair instrument cable (Belden 3106A or equivalent) The maximum distance
between the furthest gas detector and MGS-408 Gas Detection Controller is 4500 feet (1372 m)
when only using Modbus communications. The available distance is less when using the
controller as the power supply for gas detectors. The total power available for gas detectors is
51W. Careful attention to voltage drop over distance with a suitable wire gauge employed is
also required. Use any of the remaining cable glands to gain access to the interior of the unit.
The RS-485 communication wiring between the gas monitor and MGS-408 Gas Detection
Controller must be connected in the following manner:

1. Locate the RS-485 connector in the gas monitor (See appropriate gas monitor
manual).

2. Connect one lead of a twisted shielded pair to the “B” connection point; note the wire
color.

3. Connect the second wire to the “A” connection point; note the wire color.

4. Connect the ground to the “GND” connection point

5. Connect the shield or drain wire to the “SH” connection point.

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Locate the RS-485 connectors in the MGS-408 Gas Detection Controller. The left RS-485

NOTE: Power for the external alarms can be tapped off the AC IN connector.

NOTE: The relay contacts are rated 5A at 250VAC (N.O. contact) and 2A at

250VAC (N.C. contact).

connector is for downstream “slave” devices (includes a dedicated shield position) and the right
RS-485 connector is used to connect to “master” devices upline, such as building management
controls.

3.6.2 Integration with Building Management System

A second RS‑ 485 connector allows a Building Management System to communicate with the
MGS-408 Gas Detection Controller via Modbus protocol (see Section 5.2 for register mapping).
The connection is established using a shielded twisted pair cable such as Belden 3106A. Use
any of the remaining service cable glands to gain access to the interior of the MGS-408 Gas
Detection Controller. Locate the RS‑ 485 upline connector. Secure the wire leads to the
connector in the orientation as displayed on the board. Check to make sure the polarity matches
the wiring to the Building Management System. The shield connection should only be grounded
at the BMS device and should not be connected at the controller.

3.7 Connecting External Alarms

3.7.1 Overview

One switched 24V DC contact marked “BEACON” is available for the connection of an external
alarm device. The terminals can sink up to 300 mA at 24V DC. Bacharach accessory light P/N

1100-23XX is intended for use with the terminal. Form C relay contacts are provided for FAULT,

LOW ALARM and HI ALARM conditions.

3.7.2 Connection Procedure

Use the remaining cable glands to gain access to the interior of the MGS-408 Gas Detection
Controller. Locate the relay connectors. Secure the wire leads to the connectors

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4. Operation

4.1 Overview

4.1.1 Main Function

Every 5 seconds the MGS-408 Gas Detection Controller collects gas concentration and status
information from each connected gas detector. Gas concentration appears on the LCD display
and connection status, fault and alarm conditions are indicated by the LED matrix for each
channel. When an SD card is installed, concentration and status information is logged every 10
seconds for all connected gas detectors. Detector data and controller status information can
also be communicated via MODBUS, to a master or BMS device.

4.1.2 Post

After power up, the firmware revision level will be indicated on the LCD followed by an LED/LCD
and beacon self test. The controller will then begin scanning connected detectors and display
their reported gas concentration on the LCD and status information on the LED matrix.

4.1.3 Channel number keys

Pressing a Channel number key will bring up a scrollable channel detail screen with detector
specific information. Pressing the channel number key a second time will access the channel
setup menu.

4.1.4 Menu access and navigation

The system level menu is accessed by pressing the OK key while the main screen is being
displayed. The currently selected menu item is indicated with triangle pointers to the left and
right of the description. If the menu list is longer than can be displayed, up and down arrow keys
on the right side of the screen will indicate additional items are available by either scrolling up or
down.

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Some of the screens you will access will require data entry, such as the date/time setup or
location description. These screens will appear with a character selected, as displayed below.
Use the up/down Arrow keys to scroll through the characters provided for that character’s place.
Use the left/right Arrow keys to move the cursor to the next character. When all character
selections for the screen are completed, press ENTER to accept the entries.

4.2 Controller Setup

4.2.1 Setup Parameters

Before using the controller various parameters must be set by the user based on how the
controller has been wired. These parameters are accessed from the main menu by selecting
”CONTRLR CONFIG”.

4.2.2 Relay Setup

From the RELAY menu, each of the three relays can be configured for either normal or failsafe
operation. The default is normal, meaning normally open contacts will close with the event
corresponding the relay designation. If fail safe is selected the relay will be normally energized
and will be de-energized with the relays designated event or a power failure.

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4.2.3 AV Alarm

The beacon, if installed, and the internal buzzer may be enabled to indicate an alarm condition.
When enabled, the beacon will be energized, and the buzzer will beep, if either a low or high
alarm condition exists.

4.2.4 Fault Latching

Fault latching defaults to DISABLED, allowing the fault indication to clear with the condition
without user intervention. When ENABLED the fault indication will persist after the condition has
cleared, until a user clears the current faults by selecting “CLEAR FAULT” from the diagnostic
menu.

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4.2.5 Bluetooth

To use the Bacharach smart phone app, before connecting you must ENABLE Bluetooth from
this menu screen.

4.2.6 LCD Contrast

From the LCD contrast setting screen, use the arrow keys to adjust the contrast from 1-63, with
30 being the default.

4.2.7 LED Brightness & Auto-dimming

The brightness of front panel LEDs can be adjusted from 0-10. A full bright setting of 10 will be
visible from a long distance but may be too bright when the user is operating the keypad. For
this reason, when the keypad is in use the LED brightness will auto-dim to a comfortable level,
and resume the programmed brightness setting after a period of keypad inactivity

4.2.8 Date/Time

The real time clock should be checked and set after installation or when the coin cell battery is
changed. Enter or edit the month, day, year, hour and minute by scrolling the menu.

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IMPORTANT: Make note of your password and save it.

4.2.9 Password Protection

The MGS-408 Gas Detection Controller can be password protected to prevent the unauthorized
editing of setup parameters. When password protection is enabled, an operator may still
navigate between screens to observe settings or monitor network status. The unit is shipped
with password protection OFF. Entering a 3 digit (non-zero) password enables password
protection. After protection is enabled, the user will be prompted to enter the password when an
attempt is made to edit a setup parameter. After entering the password, a 30 minute time period
will be allowed for entries, after which the user will again be prompted to re-enter the password.
To disable password protection, simply change the password to all zero’s (000). An emergency

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4.2.10 Factory Reset

Selecting FACTORY RESET will revert all user settings to their factory out of box defaults. A
confirmation screen will ask the user to confirm their intent since user settings will be lost and
you will need to re-configure each channel. For this reason record settings in each channel edit
screen before performing a reset.

4.2.11 Update Firmware

When updated firmware is available, it can be installed via the SD card. Select ‘SD EJECT’ from
the ‘DATA LOGGING’ menu and remove the SD card. Using a PC or Laptop, rename the new
firmware image file to MGS408.txt and copy it onto the SD card. Re-install the SD card into its
slot in the controller and select ‘UPDATE FIRMWARE from the ‘CONTRLR CONFIG’ menu. The
new firmware will first be copied to flash memory, verified and moved to the application space
followed by a reboot. This process may take several minutes.

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4.3 Channel Summary and Setup

Pressing a CHx key from the main screen will bring up a channel summary screen with detailed
information collected from the gas detector assigned to that channel.

4.3.1 Channel Setup Overview

Prior to setting channel parameters, the installer should verify and record the instrument type,
node address and baud rate for each connected detector. All detectors must be set for the same
baud rate, either 9600 (default) or 19200, and must have a unique node address. The MASTER
BAUD setting in the MODBUS CONFIG menu must match the settings of the detectors. The
channel setup screen may be accessed either by selecting CHANNEL CONFIG from the main
menu or by pressing the channel number key twice at the main screen. For each detector
channel there are 4 parameters the user set MON, TYP, ADR, LOC.

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4.3.2 CHx MON (Monitor)

NOTE: All gas monitors on the network must have the same baud rate.

This parameter set to ON or OFF, enables or disables the monitoring of the gas detector
assigned to that channel. When set to ON the controller will attempt to collect data, every 5
seconds, from the gas detector type and at the node address specified in the corresponding
channel parameters. Successful communication will be indicated with a solid green LED next to
the channel number key. Each time data is collected the LED will flicker to indicate
communication access. Failed communication will be indicated by a blinking green LED and
yellow system fault LED. Failed communication can be caused by a mismatch of either node
address, instrument type or baud rate settings between the controller and the detector, or an
unpowered detector. Setting the MON parameter to OFF will exclude the gas detector assigned
to that channel from being scanned. If all channels have monitor parameters set to OFF a
system level fault will be triggered to indicate no detectors are being monitored.

4.3.3 CHx TYP (Instrument Type)

The instrument type parameter indicates what instrument model is connected to CHx, there are
6 supported instrument types, MGS250, MGS410, MGS450, MGS460, MGS550S1,
MGS550S2. For MGS 550 models the S1 and S2 designation specify which of the two sensors
connected, are to be assigned to CHx.

4.3.2 CHx ADR (Node Address)

Each connected detector must have a unique node address (see detector instruction manual for
how to set the detector node address). Select the node address corresponding to the detector
assigned to CHx, valid addresses are 1-247.

4.3.2 CHx LOC (Location)

For each channel a 16 character string may be defined to describe the name or location of the
detector assigned to that channel. This string will appear in the CHx detail summary screen as
an aid to identify the location of the associated gas detector.

4.4 Data Logging

4.4.1 Data Logging Overview

With an SD card installed, the MGS408 will log concentration, units of measure, gas name, low
alarm state, high alarm state, detector fault code and controller fault code, every 10 seconds.

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Log data is buffered for 10 minutes before writing to the SD card, so it is important to use the
‘SD EJECT’ menu item before removing the SD card, this will write the contents of the buffer
and turn off data logging, so the card is ready to be removed. Log data is divided into weekly
files using the naming convention MGS408_LOG_WEEK_XXX_OF_YYYY.csv, where XXX is
the week number (1-52) and YYYY is the year. The file format is comma delimited text which
can be opened directly in Microsoft Excel. Row 1 will contain a descriptive header for each
column. The supplied 32Gb SD card can hold up to 10 years of log data.

4.4.2 SD Card Requirements\

The MGS408 comes with a 32Gb SD card installed, which can hold up to 10 years worth of log
data. A compatible SD card will have 32GB or less capacity and be formatted in the FAT32
format.

4.4.3 Data Logging Menu

From the data logging menu the user can safely eject the SD card, turn logging ON or OFF,
view the percentage of free space remaining on the SD card, and view any current or historical
fault codes.

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4.4.3.1 SD EJECT

Select this option just prior to removing the SD card. This will write any buffered log data to the
card and turn off logging. Logging will automatically resume when the SD card is re-installed.

4.4.3.2 LOGGING (ON/OFF)

Enable or disable data logging by setting this item to ON or OFF.

4.4.3.3 SD %FREE

Shows the percentage of free space remaining on the installed SD card

4.4.3.4 SD FAULT (XX)

Any faults associated with the SD card will display as a two digit code next to this menu item,
and selecting it will bring up a scrollable list of faults in English. Selecting a fault item will bring
up a suggested remedy. SD card specific faults include:

- SD CARD MISSING (01)

- SD POWER FAIL (02)

- SD CARD FULL (04)

- SD MOUNT FAIL (08)

- SD FILE FAIL (10)

- SD WRITE FAIL (20)

- SD CAP READ (40)

- SD WRITE PROTECT (80)

4.4.3 LAST FLT (XX)

This item displays a two digit fault history code, and selecting it will bring up a scrollable list of
faults in English. Selecting a fault item will bring up a suggested remedy. The code may be
cleared from the diagnostic menu by selecting “CLR LAST SDFAULT”.

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5. MODBUS

5.1 MODBUS Overview

MODBUS RTU protocol is utilized both for downstream detector communication and upstream
BMS communication. Communication parameters may be set from the MODBUS CONFIG
menu.

The MGS-408 controller acts as a MODBUS master device on the detector side, and as a
MODBUS slave device on the BMS side.

5.1.1 MASTR BAUD (XXXX)

Slave devices (gas detectors) communicate with the master device (MGS4088 Controller) at
this baud rate, either 9600(default) or 19200.

5.1.2 SLAVE NODE (XXX)

This is the Modbus node address (1-247) that the upstream BMS will need to use when sending
queries to the controller.

5.1.3 SLAVE BAUD (XXXX)

The MGS408 controller will us this baud rate to communicate with the upstream BMS or
MODBUS master device, either 9600(default) or 19200.

5.1.4 SLAVE PRTY (XXXX)

This PARITY setting should match the BMS PARITY (NONE, EVEN or ODD).

5.1.5 SLAVE STOP (X)

The number of stop bits (1 or 2) must match the BMS setting.

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5.1.6 SLAVE TERM

R
E
A
D

W
R

I
T
E

Register
Address

Func Code 04

(read input registers)

Type Item Group Notes

R

W

30001

Sensor 1 is monitord flag

DYN

Sensor 1

0=NOT MONITORED
1=MONITORED

R

X

30002

Sensor 1 communicatin status

DYN

Sensor 1

1=COM NORMAL,
2=COM FAIL

R

X

30003

Sensor 1 modbus error code

DYN

Sensor 1

Exception code from
Modbus standard

R

X

30004

Sensor 1 concentration

DYN

Sensor 1

0-65535

R

X

30005

Sensor 1 status code

DYN

Sensor 1

0=OFFLINE
1=WARMUP
2=ONLINE

R

X

30006

Sensor 1 Fault code (high byte)

DYN

Sensor 1

Sensor specific

R

X

30007

Sensor 1 sensor fault code

DYN

Sensor 1

Sensor specific

R

X

30008

Sensor 1 ° C

DYN

Sensor 1

Sensor specific

R

X

30009

Sensor 1 Cal expired flag

DYN

Sensor 1

0=Cal Valid, 1=Cal
expired

R

X

30010

Sensor 1 Low alarm flag

DYN

Sensor 1

0=No alarm, 1=Alarm

R

X

30011

Sensor 1 High alarm flag

DYN

Sensor 1

0=No alarm, 1=Alarm

R

X

30012

Sensor 1 Saturation flag

DYN

Sensor 1

0=Unsaturated,
1=Saturated

R

X

30013

Sensor 1 Underflow flag

DYN

Sensor 1

0=Normal,
1=Underflow

R

W

30014

Sensor 1 Instrument Type code

STA

Sensor 1

0=MGS250,1=MGS400,
2=MGS450,3=MGS460,
4=MGS550­S1,5=MGS550-S2

R

W

30015

Sensor 1 Node Address

STA

Sensor 1

1-254

R

X

30016

Sensor 1 Sensor Type code

STA

Sensor 1

Sensor specific

R

X

30017

Sensor 1 Concentration Units

STA

Sensor 1

1=ppm,2=ppb,3=%VOL
,4=%LEL

R

X

30018

Sensor 1 Scale Factor

STA

Sensor 1

Power of 10 used on
concentration, divide
conc by 10^x for

A 120 ohm termination resistor can be enabled on the BMS connection. This is typically only
required for cable lengths in excess of 1000’, for shorter distances set this termination to OUT.

5.2 MODBUS Registers

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correct value (MGS550
only)

R

X

30019

Sensor 1 Gas Type Text Char 1,2

STA

Sensor 1

ASCII characters

R

X

30020

Sensor 1 Gas Type Text Char 3,4

STA

Sensor 1

ASCII characters

R

X

30021

Sensor 1 Gas Type Text Char 5,6

STA

Sensor 1

ASCII characters

R

X

30022

Sensor 1 Gas Type Text Char 7,8

STA

Sensor 1

ASCII characters

R

X

30023

Sensor 1 Gas Type Text Char 9,10

STA

Sensor 1

ASCII characters

R

X

30024

Sensor 1 SID Text Char 1,2

STA

Sensor 1

ASCII characters

R

X

30025

Sensor 1 SID Text Char 3,4

STA

Sensor 1

ASCII characters

R

X

30026

Sensor 1 SID Text Char 5,6

STA

Sensor 1

ASCII characters

R

X

30027

Sensor 1 SID Text Char 7,8

STA

Sensor 1

ASCII characters

R

X

30028

Sensor 1 UID Text Char 1,2

STA

Sensor 1

ASCII characters

R

X

30029

Sensor 1 UID Text Char 3,4

STA

Sensor 1

ASCII characters

R

X

30030

Sensor 1 UID Text Char 5,6

STA

Sensor 1

ASCII characters

R

X

30031

Sensor 1 UID Text Char 7,8

STA

Sensor 1

ASCII characters

R

X

30032

Sensor 1 Alias Text Char 1,2

STA

Sensor 1

ASCII characters

R

X

30033

Sensor 1 Alias Text Char 3,4

STA

Sensor 1

ASCII characters

R

X

30034

Sensor 1 Alias Text Char 5,6

STA

Sensor 1

ASCII characters

R

X

30035

Sensor 1 Alias Text Char 7,8

STA

Sensor 1

ASCII characters

R

X

30036

Sensor 1 Alias Text Char 9,10

STA

Sensor 1

ASCII characters

R

X

30037

Sensor 1 Alias Text Char 11,12

STA

Sensor 1

ASCII characters

R

X

30038

Sensor 1 Alias Text Char 13,14

STA

Sensor 1

ASCII characters

R

X

30039

Sensor 1 Alias Text Char 15,16

STA

Sensor 1

ASCII characters

R

X

30040

RESERVED

Sensor 1

R

X

30041

RESERVED

Sensor 1

R

X

30042

RESERVED

Sensor 1

R

X

30043

RESERVED

Sensor 1

R

X

30044

RESERVED

Sensor 1

R

X

30045

RESERVED

Sensor 1

R

X

30046

RESERVED

Sensor 1

R

X

30047

RESERVED

Sensor 1

R

X

30048

RESERVED

Sensor 1

R

X

30049

RESERVED

Sensor 1

R

X

30050

RESERVED

Sensor 1

R

X

30051-30100

SENSOR 2 DATA GROUP

(REPEAT OF SENSOR 1)

Sensor 2

R

X

300101-30150

SENSOR 3 DATA GROUP

(REPEAT OF SENSOR 1)

Sensor 3

R

X

30151-30200

SENSOR 4 DATA GROUP

(REPEAT OF SENSOR 1)

Sensor 4

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R

X

30201-30250

SENSOR 5 DATA GROUP

(REPEAT OF SENSOR 1)

Sensor 5

R

X

30251-30300

SENSOR 6 DATA GROUP

(REPEAT OF SENSOR 1)

Sensor 6

R

X

30301-30350

SENSOR 7 DATA GROUP

(REPEAT OF SENSOR 1)

Sensor 7

R

X

30351-30400

SENSOR 8 DATA GROUP

(REPEAT OF SENSOR 1)

Sensor 8

R

X

31000

Sensor 1 Concentration

DYN

Sensor 1

R

X

31001

Sensor 2 Concentration

DYN

Sensor 2

R

X

31002

Sensor 3 Concentration

DYN

Sensor 2

R

X

31003

Sensor 4 Concentration

DYN

Sensor 3

R

X

31004

Sensor 5 Concentration

DYN

Sensor 4

R

X

31005

Sensor 6 Concentration

DYN

Sensor 5

R

X

31006

Sensor 7 Concentration

DYN

Sensor 6

R

X

31007

Sensor 8 Concentration

DYN

Sensor 7

R

X

31008-31031

RESERVED

DYN

Future

sensors

R

X

31032

Sensor 1 Fault code (high bytes)

DYN

Sensor 1

R

X

31033

Sensor 1 Fault code

DYN

Sensor 1

R

X

31034

Sensor 2 Fault code (high bytes)

DYN

Sensor 2

R

X

31035

Sensor 2 Fault code

DYN

Sensor 2

R

X

31036

Sensor 3 Fault code (high bytes)

DYN

Sensor 3

R

X

31037

Sensor 3 Fault code

DYN

Sensor 3

R

X

31038

Sensor 4 Fault code (high bytes)

DYN

Sensor 4

R

X

31039

Sensor 4 Fault code

DYN

Sensor 4

R

X

31040

Sensor 5 Fault code (high bytes)

DYN

Sensor 5

R

X

31041

Sensor 5 Fault code

DYN

Sensor 5

R

X

31042

Sensor 6 Fault code (high bytes)

DYN

Sensor 6

R

X

31043

Sensor 6 Fault code

DYN

Sensor 6

R

X

31044

Sensor 7 Fault code (high bytes)

DYN

Sensor 7

R

X

31045

Sensor 7 Fault code

DYN

Sensor 7

R

X

31046

Sensor 8 Fault code (high bytes)

DYN

Sensor 8

R

X

31047

Sensor 8 Fault code

DYN

Sensor 8

R

X

31048-31096

RESERVED

Future

sensors

Register
Address

Func Code 03/06

Read/preset

Item Group

Notes

R

W

40000

Future unused

STA

Controller-related

return zero always

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R

W

40001

Future unused

STA

Controller-related

return zero always

R

W

40002

RS-485 Node Address

STA

Controller-related

1-254

R

W

40003

Baud Rate

STA

Controller-related

0=9600 1=19200

R

W

40004

Stop Bits

STA

Controller-related

1 or 2

R

W

40005

Parity

STA

Controller-related

0=none 1=odd 2=even

R

W

40006

Controller UID Char 1,2

STA

Controller-related

ASCII characters

R

W

40007

Controller UID Char 3,4

STA

Controller-related

ASCII characters

R

W

40008

Controller UID Char 5,6

STA

Controller-related

ASCII characters

R

W

40009

Controller UID Char 7,8

STA

Controller-related

ASCII characters

R

X

40010

16 bit Current Fault Code Controller

DYN

Controller-related

0-65535

R

X

40011

16 bit Last Fault Code Controller

DYN

Controller-related

0-65535

R

X

40012

Software Version Controller

STA

Controller-related

X100

R

W

40013

Relay 1 Contact Behavior / Failsafe

DYN

Controller-related

0=normal 1=Failsafe

R

W

40014

Relay 2 Contact Behavior / Failsafe

DYN

Controller-related

0=normal 1=Failsafe

R

W

40015

Relay 3 Contact Behavior / Failsafe

DYN

Controller-related

0=normal 1=Failsafe

R

X

40016

24V supply voltage x 100

DYN

Diagnostics

2400=24.00V

R

X

40017

24V supply output to sensors

voltage x 100

DYN

Diagnostics

2400=24.00V

R

X

40018

Battery voltage x 100

DYN

Diagnostics

300=3.0V

R

X

40019

Controller 5V supply voltage x100

DYN

Diagnostics

500=5.00V

R

X

40020

Controller 3.3V supply voltage x100

DYN

Diagnostics

330=3.30V

R

X

40021

Controller temperature x100

DYN

Diagnostics

2500=25.00degC

R

X

40022

Controller tact and mag switch

state

DYN

Diagnostics

Sum of activated
switch values

R

W

40023

Buzzer enable

STA

Controller-related

0=Disabled 1=enabled

R

W

40024

Data Logging Enabled

STA

Controller-related

0=Disabled 1=enabled

R

W

40025

Fault Latching Enabled

STA

Controller-related

0=Disabled 1=enabled

Func Code 02

(read input status)

Item Group

R

X

10001

Sensor 1 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 1

R

X

10002

Sensor 2 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 2

R

X

10003

Sensor 3 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 3

R

X

10004

Sensor 4 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 4

R

X

10005

Sensor 5 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 5

R

X

10006

Sensor 6 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 6

R

X

10007

Sensor 7 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 7

R

X

10008

Sensor 8 Low Alarm Flag (0 or 1 = alarm)

DYN

Sensor 8

R

X

10009-10032

RESERVED

Sensor 9-

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R

X

10033

Sensor 1 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 1

R

X

10034

Sensor 2 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 2

R

X

10035

Sensor 3 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 3

R

X

10036

Sensor 4 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 4

R

X

10037

Sensor 5 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 5

R

X

10038

Sensor 6 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 6

R

X

10039

Sensor 7 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 7

R

X

10040

Sensor 8 High Alarm Flag (0 or 1 = alarm)

DYN

Sensor 8

R

X

10041-10064

RESERVED

Sensor 9­32(future)

R

X

10065

Sensor 1 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 1

R

X

10066

Sensor 2 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 2

R

X

10067

Sensor 3 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 3

R

X

10068

Sensor 4 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 4

R

X

10069

Sensor 5 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 5

R

X

10070

Sensor 6 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 6

R

X

10071

Sensor 7 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 7

R

X

10072

Sensor 8 Any Alarm Flag (0 or 1 = alarm)

DYN

Sensor 8

R

X

10073-10096

RESERVED

Sensor 9­32(future)

R

X

R

X

10097

Sensor 1 Fault Flag (0 or 1 = fault)

DYN

Sensor 1

R

X

10098

Sensor 2 Fault Flag (0 or 1 = fault)

DYN

Sensor 2

R

X

10099

Sensor 3 Fault Flag (0 or 1 = fault)

DYN

Sensor 3

R

X

10100

Sensor 4 Fault Flag (0 or 1 = fault)

DYN

Sensor 4

R

X

10101

Sensor 5 Fault Flag (0 or 1 = fault)

DYN

Sensor 5

R

X

10102

Sensor 6 Fault Flag (0 or 1 = fault)

DYN

Sensor 6

R

X

10103

Sensor 7 Fault Flag (0 or 1 = fault)

DYN

Sensor 7

R

X

10104

Sensor 8 Fault Flag (0 or 1 = fault)

DYN

Sensor 8

R

X

10105-10128

RESERVED

Sensor 9­32(future)

R

W

10129

Sensor 1 enabled flag (0=disabled 1=enabled)

DYN

Sensor 1

R

W

10130

Sensor 2 enabled flag (0=disabled 1=enabled)

DYN

Sensor 2

R

W

10131

Sensor 3 enabled flag (0=disabled 1=enabled)

DYN

Sensor 3

R

W

10132

Sensor 4 enabled flag (0=disabled 1=enabled)

DYN

Sensor 4

R

W

10133

Sensor 5 enabled flag (0=disabled 1=enabled)

DYN

Sensor 5

R

W

10134

Sensor 6 enabled flag (0=disabled 1=enabled)

DYN

Sensor 6

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R

W

10135

Sensor 7 enabled flag (0=disabled 1=enabled)

DYN

Sensor 7

R

W

10136

Sensor 8 enabled flag (0=disabled 1=enabled)

DYN

Sensor 8

R

W

10137-10160

RESERVED

Sensor 9­32(future)

R

X

10200

Relay 1 State (0 or 1 = energized)

DYN

Controller-related

R

X

10201

Relay 2 State (0 or 1 = energized)

DYN

Controller-related

R

X

10202

Relay 2 State (0 or 1 = energized)

DYN

Controller-related

Func Code 01/05 (Read/force coil)

Item Group

R

00001

UNUSED

DYN

R

00002

UNUSED

DYN

R

00003

UNUSED

DYN

00004

Relay Closed Test. Setting this flag to one closes

all 3 relays simultaneously for 5 seconds. At the

end of the test the relays revert to their normal

operation. During the test the Modbus flag will

remain ON. When the test is completed the flag

will turn OFF

DYN

00005

Relay Opened Test. Setting this flag to one

opens all 3 relays simultaneously for 5 seconds.

At the end of the test the relays revert to their
normal operation. During the test the Modbus

flag will remain ON. When the test is completed

the flag will turn OFF

00006

UNUSED

00007

UNUSED

00008

UNUSED

Func Code 43/14

R

X

0x00

Vendor name "Bacharach"

STA

Controller-related

R

X

0x01

Product code "MGS-408"

STA

Controller-related

R

X

0x02

Major minor rev "NN.nn"

STA

Controller-related

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6. Diagnostics and Troubleshooting

6.1 Diagnostic Menu

From the diagnostic menu the user can review and clear current and historical faults, view
power supply voltages, and watch live Modbus traffic for both master, slave and Bluetooth
connections. The diagnostic menu appears on page 2 of the main menu.

6.1.1 CURRENT FAULT

Displays the current active controller fault code along with a list of fault descriptors. Scroll and
select a descriptor for more detailed information about the fault and possible remedies.

6.1.2 LAST FAULT

Displays historical fault code and listing, selecting a fault descriptor will bring up more details,
same as current fault screen. Intermittent fault conditions can be review here.

6.1.3 CLEAR FAULT

Resets the current active fault code to zero (no faults). Use to clear faults when FAULT
LATCHING is enabled from the CONTRLR CONFIG menu.

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6.1.4 CLEAR LAST FAULT

Reset the historical last fault code to zero. Use to catch recurring intermittent fault conditions.

6.1.5 CLR LAST SD FAULT

Resets the historical SD card fault code. Use to catch recurring intermittent fault conditions with
the SD card or data logging.

6.1.6 POWER

Displays live power supply voltages and chassis temperature. Use when a SUPPLY VOLTS
ERR or CHASSIS TEMP HI is indicated as a fault.
Voltage tolerances are as follows:

 SUPPLY IN=24V ± 3
 SUPPLY OUT=24V ± 3
 5V=5V ± 0.3
 3.3V=3.3V ± 0.3V
 BAT= 1.8V to 3.6V (Coin cell voltage)
 T=60 to -20degC (Internal chassis temperature)

6.1.7 MODBUS SLAVE

Displays the live Modbus traffic for the BMS connection. Use when troubleshooting
communication problems with upstream master devices. The OK key will clear the screen to
view the next query and response. For each query received by the controller from a master

device or BMS, the number of bytes transmitted TX=, the function code used FUNC=, the
register address requested ADDR=, and any errors or exceptions on the bottom line.

6.1.8 MODBUS MASTER

Displays the live Modbus traffic for each channel. Use when troubleshooting communication
problems with detectors on the slave network. Up and down arrow keys will switch channel
numbers, the OK key will clear the screen to view the next query and response. For each query

sent by the controller the number of bytes transmitted TX=, the function code used FUNC=, the
register address requested ADDR=, and any errors or exceptions on the bottom line.

6.1.9 BLUETOOTH

Displays the live Modbus traffic for the Bluetooth interface. Use when troubleshooting
communication problems with Bluetooth devices. The OK key will clear the screen to view the
next query and response. For each query received by the controller the number of bytes

transmitted TX=, the function code used FUNC=, the register address requested ADDR=, and
any errors or exceptions on the bottom line.

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6.2 FAULT CODES

Code

Critical Fault

Possible Causes

Remedy

0001

CHASSIS
TEMP HI

Chassis
temperature outside
the range of -20 to
60° C

Reduce ambient temperature or check for
power supply malfunction.

0002

RS485
MSTR BUFR

Buffer overflow
communicating with
detectors

Disable all but one channel, use MODBUS
MASTER traffic screen to one CH at a time.

0004

RS485
SLAVE
BUFR

Buffer overflow
communicating with
BMS

Use MODBUS SLAVE traffic screen to
diagnose.

0008

RS485
MSTR CRC

CRC error
communicating with
detectors

Disable all but one channel, use MODBUS
MASTER traffic screen to one CH at a time.

0010

RS485
SLAVE CRC

CRC error
communicating with
BMS

Use MODBUS SLAVE traffic screen to
diagnose.

0020

BT SLAVE
CRC

CRC error
communicating with
Bluetooth APP

Use BLUETOOTH traffic screen to
diagnose.

0040

RS485 SL
TMOUT

Modbus timeout
communicating with
BMS

Use MODBUS SLAVE traffic screen to
diagnose.

0080

BLE
EEPROM

Error configuring
Bluetooth
transceiver

Reset, or Reboot controller, if fault persists,
consult factory.

0100

BT SLAVE
BUF

Buffer overflow
communicating with
Bluetooth APP

Use MODBUS SLAVE traffic screen to
diagnose.

0200

STUCK KEY
ERROR

On or more keys on
the keypad are
stuck down

Use KEYPAD TEST to determine stuck
key, consult factory.

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0400

CONFIG
ERROR

All detectors are
disabled or there
are duplicate node
addresses

Enable one or more channels, or check for
duplicate node address assignment.

0800

SD CARD
ERROR

SD card interface is
reporting an error
(see section X.X.X)

Select SD FAULT from DATA LOGGING
menu for details.

1000

SENSOR
RESPONSE

One or more
detectors are not
responding to
queries

Disable all but one channel, use MODBUS
MASTER traffic screen to test one CH at a
time

2000

SUPPLY
VOLTS ERR

One or more power
supply voltages are
out of range

Check POWER screen in diagnostic menu,
if SUPPLY OUT is <23.7V check for short
or overload on detector supply feed. If
battery voltage is less than 1.8V replace
coin cell. Otherwise consult factory.

4000

CPU ERROR

Microcontroller
malfunction

Reset or reboot controller, if fault persist,
consult factory.

8000

EEPROM
ERROR

EEPROM
malfunction

Consult factory.

6.3 SYSTEM TESTS

To facilitate installation and troubleshooting the following test are available from the SYSTEM
TEST menu

6.3.1 RELAY TEST

Manually toggle each relay using the CH key indicated.

6.3.2 LED TEST

Using the OK key, all front panel LED will illuminate when pressed

6.3.3 KEYPAD TEST

Key designation will be indicated on the screen for each key pressed

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6.3.4 STROBE TEST

Manually toggle the strobe, if installed, using up and down arrow keys

6.3.5 FAN TEST

Manually toggle the chassis cooling fan using the up and down arrow keys

1100-2295 Rev 0 39

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7. Additional Information

Product Type

8 Channel Gas Detector Controller

Number of Channels

1-8

Display

4 × 20 LCD w/ Backlight

Ambient Temperature Range

-20 to +50° C

Power Supply

80-264VAC 70W max

Power Output

24VDC 51W max

Accessory Alarm

A/V Strobe 24VDC 300ma max

Relays

1-Fault, 1-LO Alarm, 1-HI Alarm, Form C
contacts rated 5A at 250VAC (N.O. contact)
and 2A at 250VAC (N.C. contact).

Communications

1-Modbus Master, 1- Modbus Slave, RTU
protocol, 9600 or 19200 baud.

Housing

Nema 1 Wall Mount

Approvals

UL/CSA/IEC/EN 61010-1 CE

7.1 Disposing of Instrument

EU-wide regulations governing the disposal of electrical and electronic appliances which have
been defined in the EU Directive 2012/19/EU and in national laws have been effective since
August 2012 and apply to this device.

Common household appliances can be disposed of using special collecting and recycling
facilities. However, this device has not been registered for household usage. Therefore it must
not be disposed of through these channels. The device can be returned to your national
Bacharach Sales Organization for disposal.

7.2 Technical Specifications

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8. Parts & Accessories

Part Number

Description

6702-8000

MGS-408 gas detection controller, 8 channels

1100-2307

Optional horn/strobe, mounts directly onto MGS-408, red lens

1100-2308

Optional horn/strobe, mounts directly onto MGS-408, green lens

1100-2309

Optional horn/strobe, mounts directly onto MGS-408, blue lens

1100-2310

Optional horn/strobe, mounts directly onto MGS-408, yellow lens

Part Number

Description

3015-8041

Horn + strobe 24 V DC; blue lens

3015-8044

Strobe; blue lens; MP120K 120 V AC adapter

3015-8043

Horn + strobe 24 V DC; red lens

3015-8046

Strobe; red lens; MP120K 120 V AC adapter

3015-8042

Horn + strobe 24 V DC; amber lens

3015-8045

Strobe; amber lens; MP120K 120 V AC adapter

8.1 Part Numbers

8.1.1 MGS-408 Configurations

8.1.2 MGS-400 Series Accessories

1100-2295 Rev 0 41

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