---
title: Vapour Recovery Vent Interlock for RCM Permissive
description: Some customers require a vapour recovery vent interlock for loading at a rack. The vapour recovery vent must be open for loading. The vapour recovery vent must be open before the RCM permits
---
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1. [Titan Help Center](https://help.titanlogix.com/?hsLang=en)
2. [FINCH II, FINCH 5332E and FINCH IN-CAB Systems (Discontinued)](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en)
3. [Rack Control Module (RCM) and Titan Supplied API Sockets](https://help.titanlogix.com/finch-ii-finch-5332e-and-finch-in-cab-systems-discontinued?hsLang=en#rack-control-module-rcm-and-titan-supplied-api-sockets)
# Vapour Recovery Vent Interlock for RCM Permissive
**The Issue**
Some customers require a vapour recovery vent interlock for loading at a rack. The vapour recovery vent must be open for loading.
The vapour recovery vent must be open before the RCM permits loading.
- The open vapour recovery vent is detected by a switch on the vent control. This can be a mechanical or pneumatically operated switch.
- The vent interlock switch provides power to the RCM when the vent is open. Power is removed from the RCM when the vent is closed.
- The RCM can permit loading only when all conditions are safe for loading including the open vapour recovery vent.
**Solution With RCM and FINCH II-6W Display Only**
- The FINCH II-6W controls the RCM to allow or deny loading. This is normal operation for the FINCH II-6W with RCM enabled.
- The Display Enable input puts the display into sleep mode. SV bus 6 is then inactive. The RCM denies loading at the rack.
- The vent operated interlock switch applies a grounded signal to the Display Enable input when the vent is open. A closed vent opens the interlock switch and puts the FINCH II-6W to sleep and prevents loading.
- The normal Display Enable jumper to ground is replaced with a connection to the switch on the vent control. Grounded connection for Monitor mode, open-circuit for Sleep mode.
- This solution is for the FINCH II-6W only.
**Solution With RCM and FINCH II-W or FINCH II-6W Displays**
- The FINCH II-W does not control the RCM. RCM is connected directly to the transmitters.
- A normally open interlock switch on the vent control provides power to the RCM when the vent is open. Power to the RCM is removed when the vent is closed.
- This solution is for FINCH II-W and FINCH II-6W displays.
**RCM Power Control Suitable for the FINCH II-W with 1 TD100 Transmitter**
****
**RCM Power Control Suitable for the FINCH II-W with 2 TD100 Transmitters**
****
**RCM Power Control Suitable for the FINCH II-6W with Up To 5 TD100 Transmitters**
****
---
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