RTX1-SDX Transmitter (For Mounting Directly Within Plant Or Manifold) – Shire Controls

01279 434399


RTX1-SDX Transmitter (For Mounting Directly Within Plant Or Manifold)

Class 1 Medical Device: Medical Gas Pipeline Systems
For more information & documentation please Contact us.

The RTX1-SDX transmitter links to the SDX-15 Alarm system via 2-core data bus cable.
The transmitter is mounted directly within (or adjacent to) the gas source.
4no input signals are wired directly from the plant or manifold, using failsafe logic – open contact=fault (i.e. NO line monitoring TB4 PCBs).
Inputs connections comprise a 5-core cable (4no switched conditions and 1no Common).

Transmitter PCB requires a 230vac supply.
All supply, input and data-bus terminations are via simple 45deg PCB mounted terminals.

The RTX1-SDX is only manufactured for a single gas, as the design is intended for mounting to be directly at the contact source.
Thus, as input connections will be nearby, these transmitters have no requirement for line monitoring, which simplifies installation and cost.

The transmitter incorporates a single channel selector switch which determines the transmitted channel for the monitored.

The RTX1-SDX transmitter receives 4no analogue signals from the plant or manifold where it is installed and then transmits these signals via a 2-core data-bus using Shire Controls own Medcon signal protocol. A single 2-core data-bus can transmit up to 60 status conditions (15no gases, each with up to 4no condition) and channels are determined via hexadecimal (16 way) rotary switches for transmitting (via SDX-15 transmitters) and receiving for display purposes (via SDX-15 Plant Alarms) or for interfacing to others (via SDX Computer Interfaces).

Monitoring of the data-bus connection is always in operation. The transmitter looks to receive a strobe signal from the designated ‘Central Panel’ (the 24-hour monitored SDX-15 Plant Alarm), which ensures the system data-bus integrity. Any short-circuit, open-circuit or non-presence of a Central Panel will result in the transmitter giving a visual warning of this system fault via a flashing round red LED.

As the system is addressable, ALL SDX-15 system equipment (Alarms, Transmitters and Interfaces) can be added/removed or relocated within the system. This simply requires the 2-core data-bus to be extended from the nearest existing SDX-15 Unit, or tee-ing off from a nearby existing cable run. Use 2-core screened cable (minimum 0.5mm).

RTX1-SDX PCB LED Indicators:

  • Red – This LED will be OFF if the system is functioning. The LED will flash if any of these occur:
    There is a short circuit anywhere on the 2-core data-bus cable.
    There is an open-circuit on the 2-core data bus cable between the designated ‘Central Panel’ and the SDX-RTX Transmitter.
    The designated ‘Central Panel’ has been switched off (i.e. has neither power nor battery back-up operating).
    The designated ‘Central Panel’ has is set-up as a ‘Repeater’ or the Control PCB has been unplugged.

Installation requirements:
A 230 vac supply, fused at 3 amps, fed from the essential supply
A 2-core screened cable (minimum 0.5mm) to SDX-15 data-bus.
A 5-core screened cable from input gas connected.
All screens to be earthed at BOTH ends.

Equipment Warranty:
Warranty: alarms returned to our works which have failed due to faulty parts or manufacture will be repaired (or replaced) without charges for parts and labour.
10 year compatibility warranty: Install the SDX Plant Alarm System with the confidence that equipment will be available to modify or extend the system for at least 10 years.

HTM 02-01 compliant

Part Numbers:
When ordering, please specify the following format:

RTX1  – for Complete Transmitter in A Box

RTX1plate&pcb – for RTX1 PCB on mounting plate

RTX1pcb – RTX1 PCB Only

If possible, the hospital in which the alarm is to be installed.



RTX1-SDX Surface Box Dimensions150mm110mm70mm
RTX1-SDX PCB On Mounting Plate Dimensions94mm108mm45mm
RTX1-SDX PCB Only Dimensions81mm73mm42mm

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