Intercall 600/700 Installation & Operation Guide Issue 4.27 Page 40 of 78
RB1 Relay Board.
The RB1 Relay board converts the O/C output from the LCD Displays (L628,L758) and L746 Overdoor Light into
‘Normally Open’ and ‘Normally Closed’ contact sets. The unit may also be configured by the factory to provide time
delays for some access door applications. It may also be used to trigger a call point from a external voltage (such as
door bells etc). The unit is fitted with a ‘T’ 12v output which may be used to drive low current devices from the
network.
Network Terminals: Connect to the Intercall 600 or 700 (2 wire) Network. [+, –] OBSERVE POLARITY
T Terminal: 12volt DC output which may be used to drive external equipment which requires a DC
supply. MAXIMUM OUTPUT LOAD: 12VOLTS 10mA.
O/C Terminal: Open collector input from display or overdoor light to trigger on-board relay.
C: Relay Common contact
NO: Relay ‘Normally Open’ contact
NC: Relay ‘Normally Closed’ contact
MAXIMUM RELAY CONTACT RATING: 24 VOLTS DC 500mA.
Installation: Flush or surface mount in standard ‘single size’ electrical backbox. (See page 21). Connects
to system two core and optional ceiling pull switch and auxiliary devices.
Size & Weights: 80 x 80 x 40 mm, 70g
Intercall 600
9
Intercall 700
9
O/C Output from
L628,L758,L746
L628
Network
+ and -
L622/L722
12V DC to
trigger
call point
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