Related Manuals for Johnson Controls ComBus MS-CQT485-0
Summary of Contents for Johnson Controls ComBus MS-CQT485-0
- Page 1 Johnson Controls ComBus Quick Tester MS-CQT485-0 Documentation Number: MS-CQT485-0r1_1910m pn#6550 MS-CQT485-0 Manual Documentation Number MS-CQT485-0r1_1910m...
- Page 2 MS-CQT485-0 Manual Documentation Number MS-CQT485-0r1_1910m...
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Page 3: Table Of Contents
Contents Section 1: Introduction - Controls & Features ......1 ComBus Quick Tester ............. 1 Figure 1 - End & Front View ............ 2 Features .................. 1 Introduction ................2 Section 2: Operation ..............3 Initial Operation ..............3 Flow Chart 1 - Tester & User Operations ....... 4 Table 1 - Voltage Pass Display Sequence ...... -
Page 4: Section 1: Introduction - Controls & Features
Introduction – Controls & Features ComBus Quick Tester Features • Pluggable 4-Position N2 Bus Connector can accept 3-Position or 4-Position terminal blocks used on Johnson Controls Controllers • 2-Line by 8-Character LCD Display with Power On Backlighting • Display Scroll-up and Scroll-down buttons •... -
Page 5: Introduction
Section 1: Introduction • N2/MSTP Slide Switch Selects Test Mode (for future MSTP upgrade) • Self protected from accidental connection to 24VAC • Rugged drop resistant case with bright orange color protective boot uses only 5.5 x 3.4 x 1.4 inches of space. •... -
Page 6: Initial Operation
Section 1: Introduction Initial Operation Before use, install a pair of AA batteries (included) as shown in the Battery Installation section. 1. Locate the Master Controller for the communications trunk being tested. 2. Unplug the 4 pin (or 3 pin) Data Bus connection plug from the Master Controller and plug it into the Quick Tester. -
Page 7: Flow Chart 1 - Tester & User Operations
Section 2: Operations Tester & User Operations Flow Chart 1 - Tester & User Operations MS-CQT485-0 Manual Documentation Number MS-CQT485-0r1_1910m... - Page 8 Section 2: Operations When the Tester stops testing, User Checks are needed to complete Testing using the up/down keys. The User must compare the device count found to actual number of devices present, and the Add. Sum to the Engineering Check Sum provided for the installation being tested.
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Page 9: Section 3: Troubleshooting - Failure Messages
Section 3: Troubleshooting Troubleshooting - Failure Messages 3.1 – 24VAC Found 1. Unplug the connector from the Tester verify that the 24VAC power connection and Data bus connections are not swapped. 2. Use a Multimeter and check for 24VAC between the +D line and –D line connection, then between the +D and REF, and between the –D and the REF. -
Page 10: Voltage Fail Checks
Section 3: Troubleshooting Table 3 – Voltage Pass Limits. Voltage Lower Upper Parameter D=Data Bus Pass Limit Limit 2.45V 3.00V +D to REF 1.90V 2.54 -D to REF Bias = +0.38 +0.92 +D to -D +D is Data bus plus (with N2 bus = N2+) MSTP future -D is Data bus minus (with N2 bus = N2-) Voltage Fail Checks 1. -
Page 11: Example Voltage Fail Profiles
Section 3: Troubleshooting Example Voltage Fail Profiles Possible Voltage Fail Examples if one unit on the bus is misconnected compared to all the others and the REF on all units also connects to a non-isolated Common/Ground. Table 4 - Profiles Voltage Fail Example Example... -
Page 12: Troubleshooting Missing Or Bad Devices
Section 3: Troubleshooting 3.4 Troubleshooting Missing or Bad Devices 1. When the device code for one address indicates BAD, check the list of addresses found to determine what other address is missing. Two units may be set for the same address. 2. - Page 13 Section 3: Troubleshooting Table 5 - Device Type Display Dev-Code Protocol Device/Controller Type N2 Open Device not listed Air Handling Unit Controller N2 Device with invalid errors Sys91 DC-9100 – Plant Controller DCM-Digital Control Module Sys91 DO-9100 – Digital Optimizer Sys91 DR-9100 Room Controller Sys91...
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Page 14: Section 4: Battery Installation
Section 4: Battery Installation Battery Installation 1. Unplug 4-Position Terminal. 2. Remove Protective boot from the case with left hand on left corner, or use right hand on opposite. Install 2 AA alkaline cells as shown at right, and then replace protective cover by reversing the steps shown. -
Page 15: Section 5: Specifications
Section 5: Specifications Specifications Bus Type: Half Duplex RS-485 +Data, -Data and Common Mode Reference Bus Connector: 4-Position connector can accept 3-Position or 4-Position pluggable terminal block connectors. Provided with 4-position right angle 5.08mm spacing pluggable Terminal block. Data Type: Standard (9600, 8, N, 1) Display Type: 16 Character (2 lines by 8) LCD Biasing &... -
Page 16: Accessories
Section 5: Specifications Accessories Included: ComBus Quick Tester with removable orange protective boot 4-POS Pluggable Terminal Block Manual: Instruction Manual (paper copy of this booklet) Batteries: Set of two included, replace with AA alkaline MS-CQT485-0 Manual Documentation Number MS-CQT485-0r1_1910m...
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