RR-CirKits, Inc.
Specializing in Affordable Electronics for Model Railroads

Index of Firmware Upgrades  (Dec, 2025)
JMRI 5.10 or later recommended.

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Product ID
 Description
 Upgrade Firmware -
Set Factory Defaults
Upgrade Firmware -
Keep Configuration
 Comments
LB-II LocoBuffer-II Serial Interface
 N/A N/A LocoBuffer-II driver Download
LB-USB LocoBuffer-USB LocoNet Interface N/A N/A Schematics
LocoBuffer-USB drivers
Driver Install Instructions for XP -- Windows 7
Driver Install instructions for Windows 8.
Driver Install instructions for Windows 10.
LCC Buffer-USB
 Layout Command Control to USB interface
 N/A
 N/A
 Driver install for XP -- Windows 7. This folder is NOT to be used for Windows 8 -- 10 that automatically install the drivers. LCC Buffer-USB Drivers.zip
LCC-LocoNet Gateway LCC Translator to LocoNet
“Click here for more info” Dec 2025 version B9b. Added support for LocoNet and LCC fast clocks, plus 'Well Known' extended accessory commands.
Note: Rev B9b is later than Rev C1 from 2021.
LNCP LocoNet Control Point LNCP V2 Update
 Download and save
LNCP_V3_Update_Keep_Config.hex
 Work Sheets: Logic Sheet  Signal Sheet
MotorMan &
MotorMan-II
 8 Output Turnout Driver - SSB
 MotorMan V1.9
MotorMan-II V1.1
This update will overwrite your data. Be sure to restore using the roster 'CVs' entry and 'Write full sheet'.
Note: MotorMan and MotorMan-II have different firmware. Choose the appropriate file.
SignalMan-c/p 16 Output Signal Driver - SSB SignalMan V2.4 update N/A Updates brightness settings immediately when changed.
This update will overwrite your address and configuration data. Set your original address, then restore your configuration by using the roster 'CVs' tab and 'Write full sheet'.
SMD-8 Stall Motor Driver - 8 Channel N/A N/A
TC-64 64 Line I/O - LocoNet
Download and save
TC64_V8H_Update_keep_Config.hex 		TC-64 Work Sheets: Basic Sheet  Initial Sheet
The TC-64 is no longer manufactured. It has been replaced by the TowerController Mark II.
TC-Mark II 64 Line I/O - LocoNet TC Mark II V1.7 update
 N/A
 This update will overwrite your data. Be sure to restore using the roster 'CVs' entry and 'Write full sheet'. Feature upgrade requires JMRI 4.13.3 or higher.
Signal - LCC 16 lamp + 8 Line I/O for LCC Bus
Upgrade does not overwrite user data.
More info for Update C7c
 Nov 2023 (Rev C7c) version -- Use JMRI 5.4 or later.
Improved turnout cascade. Improved synchronization with JMRI.
C7c offers a fix for nodes that hang in boot mode
Signal - LCC 32H 32 head + 8 Line I/O for LCC Bus Upgrade does not overwrite user data. Download and save
SignalLCC_32H_C1c_UPDATE.hex
 Oct 2024 (Rev C1c) -- Use JMRI 5.4 or later.
A minor timing change to more closely align with the WS2811 specifications.
Tower - LCC
 16 Line I/O for LCC Bus Upgrade does not overwrite user data. More info for Update C7e1
 Nov 2023 (Rev C7e1)  -- Use JMRI 5.4 or later.
Improved turnout cascade. Improved synchronization with JMRI.
C7e1 now offers a fix for nodes that hang in boot mode
Tower - LCC+Q 16 Line I/O plus Structured Text logic engine for LCC Bus Upgrade does not overwrite user data from v1.06 or later versions. Tower-LCC-Q-V111-UPDATE.hex
  Note: Must use JMRI 5.6 or later for correct CDI display of the new Structured Text Logic engine. Updated JMRI STL Editor available in JMRI test release 5.9.1 or later.
Update V1.11 Resolved nesting issues:
  • The A(, AN(, O( and ON(, X( and XN( will now be handled correctly.
    • Update V1.10 Resolved issues:
    • Some long syntax error messages failed to display.
    • CLR could not be used in a multi-line with a label.
      •
    Update V1.09 Resolved issues:
    • Any STL logic that included more than 255 variables freezing the node.
    • Incorrect responses during node initialization.
    • Incorrect address calculation for the location of conditionals in the CDI storage area, which caused mystifying error reports with seemingly random line numbers.
    • All errors related to labels were reported with Conditional +1 due to incorrect incrementing.
    • A backward jump to a label (not allowed to avoid possible recursion problems) wasn't recognized or flagged as an error.
    • When a label was shorter than 4 characters, a label reference that started with the same characters, but longer, was mistaken for that label, e.g. 'JC END' would jump to label 'EN: <instruction>' if it appeared before the intended label 'END'.
      •
    TowerMan
    		 16 Line I/O - SSB
    		 TowerMan V2.3 update
    		This update will overwrite your data. Be sure to restore using the roster 'CVs' entry and 'Write full sheet'.
    WatchMan
    		 8 Block CT Coil Occupancy Detector - SSB
    		 WatchMan V1.5 update N/A

    This update will overwrite your data. Be sure to restore using the roster 'CVs' entry and 'Write full sheet'. Corrects a potential lockup when initializing.