Linak MJB, User Manual

Page: 9 / 24

Page 9 of 24
MJB - GATEWAY variant, 504-010 & 504-020 :
The MJB is a simple gateway interface, which can connect switch input notifications from the
infrastructure of the hospital or nursing home, such as service/nurse call systems.
Please note that notifications are only to be used as service information and not for emergency issues.
Standard functionality:
The MJB - Gateway consist of two relays, which are connected through Port 5 on the MJB. This
can be made with the special cable 0964140 (Modular plug - Open end) There are as standard 2
configurations, 504-01 and 504-02, see description on the next pages.
Relay 1: NC (normally closed) = Pin 2 + Pin 1 / NO (normally open) = Pin 2 + Pin 3
Relay 2: NC (normally closed) = Pin 5 + Pin 4 / NO (normally open) = Pin 5 + Pin 6
Relay 1
is NO when connected to the mains and NC when no mains, this means the relay is
“active”, when connected to the mains (closed loop). The Closed Loop principal is to ensure that a
notification is sent if power is missing on the bed. When the mains is disconnected (power is missing),
the relay will go from NO to NC, which will automatically result in a notification (status indicator) on
the OpenBus™.
Relay 1 can be activated via the patient control (Key 1 / Key 4) or the attendant control (Key 2 / Key
3). When a key is activated, the relay will switch state from NO to NC for 2 seconds. After 2 seconds
the relay will automatically change state from NC to NO.
The status of the relay is indicated on the OpenBus™ and can be used for switching on an LED.
Relay 2
is as default NC, with or without mains, (Open Loop)
Relay 2 can be activated via the patient control (Key 1) or the attendant control (Key 2 / Key 3).
When the relay is activated, it will switch from NC to NO for 2 seconds. After 2 seconds the relay will
automatically change state from NO to NC.
The status of the relay is indicated on the OpenBus™ and can be used for switching on an LED.
By using the variant 504-020 relay 2 will be controlled by the MJB variant 505/506 with switch input.
Notification 1 = Switch input S2 / notification 2 = Switch input S1
When using this combination, is it important to have the MJB 505/506 connected to the system all the
time. If it is not connected, the Gateway MJB will see it as a notification and the relay will be activated.
The Gateway MJB is
“scanning” the OpenBus™ system every minute for a notification.
Port 5
Port 1
OpenBus connetion
Port 5: Relay connetions
Relay 1:
- Pin 1
- Pin 2
- Pin 3
Relay 2:
- Pin 4
- Pin 5
- Pin 6
NC
NO
NC
NO