CS-105 Throttle and Device Capacity

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The CS-105 has several interfaces for connecting throttles and other devices. There are capacity limitations to these interfaces out-of-the-box, however the CS-105 can be paired with a number of accessories in order to expand the capacity.


Access Point Mode

In this mode, the CS-105 broadcasts a WiFi SSID which supports WiFi client connection of up to four devices (throttle, PC, smart phone, etc...).

CS-105 AP Mode.png

Client Mode

In this mode, the CS-105 connects to an external WiFi access point (router). It can accept connections from up to 10 other devices that are also connected to the same network.

CS-105 Client Mode.png

Connecting Additional WiFi Devices

On its own, the CS-105 is limited to 4 WiFi connected devices in Access Point Mode and 10 WiFi connected devices in Client Mode. However, the number of connected WiFi devices can be expanded by the addition of an LCC hub or router. An LCC hub or router may be connected to the CS-105 operating in either AP Mode or Client Mode by WiFi or may be connect to the CS-105 through the LCC CAN bus (dual RJ-45 jack).

CS-105 with External Hub or Router.png

WiThrottle™ and Engine Driver

WiThrottle™ and Engine Driver throttles can be connected to the CS-105 by using JMRI and the WiThrottle Protocol server. Assuming you have already set up a profile for JMRI and your CS-105, open PanelPro or DecoderPro and select Actions > Start WiThrottle Server from the Menu.

Alternatively, you can use the WFD-30 or WFD-31 module(s) from WiFiTrax. Connect the WFD to the AUX Cabs port on the CS-105. Ensure the AUX Cabs output is in Cab Bus (NCE/Ramtraxx/SystemOne) mode. These devices will host a WiThrottle server which you can connect to from a cellphone, tablet, etc.


The CS-105 uses a standard protocol called mDNS in order for throttles to automatically connect to it when placed on the same network. Using this protocol, the CS-105 broadcasts its existence over the WiFi network so that the throttles know how to find and connect to it.

Some networks and WiFi routers block or do not support mDNS packets. In this rare case, it may become necessary to configure the CS-105 to use a static IP address and manually configure each throttle to connect using this IP address.

Starting an LCC Hub in JMRI

JMRI can host an LCC "Hub" on your network which LCC devices such as the UWT-100 and UWT-50 can connect to and operate the CS-105. This assumes that you have already configured a profile for JMRI to connect to your CS-105. To start an LCC Hub in JMRi, follow these steps:

  1. Open JMRI PanelPro.
  2. From the LCC menu, choose the Start Hub option.
    JMRI Start Hub.png
  3. A window will open indicating that the hub has been started. JMRI also starts advertising itself to the network using mDNS so that other LCC devices can find it.

Running an LCC Hub in JMRI will enable the following possibilities:

  1. (Theoretically) Up to 255 simultaneous UWT connections over WiFi using Hub.
  2. TCS WiFi Throttles connected to the LCC Hub will have access to the LCC-only options such as the Programming Track.


The CS-105 integrates an NMRA Standard LCC CAN bus through a dual RJ-45 jack (labeled on the enclosure). This bus topology must meet the following requirements:

  1. Maximum length of 1000ft / 300m.
  2. Linear in topology with branches or T's limited to 10ft / 3m.
  3. Branches and T's should only be used for wired throttles.
  4. For each connected device, the maximum length should be reduced by 20ft / 6m. This means the practical limit [electrically] is around 48 connected devices.
  5. Contain exactly two terminators at the two farthest ends of the bus.

These requirements ensure reliable operation in all environments. Practically speaking, the LCC CAN bus is typically resilient to minor deviations from some of these requirements. An LCC Repeater can be used to extend the LCC CAN Bus beyond these limits. TCS recommends the RR-CirKits LCC Repeater for this purpose.

Auxiliary Bus

Cab Bus Mode

When running in Cab Bus mode (compatible with devices from NCE, Ramtraxx, SystemOne, and WifiTrax), there is a limit of 62 connected devices (throttles, etc...). For more information, see the Cab Bus documentation page.

XpressNET Mode

When running in XpressNet mode (compatible with devices from Lenz, Roco, ZTC, and others...), there is a limit of 31 connected devices (throttles, etc...). For more information, see the XpressNET documentation page.