Appendix 2
Ref: REFLEX/SCANFLEX MANUAL
EDITION 1: JULY ’97 58
SCANFLEX MULTIPLEXOR SM-10
DESCRIPTION
The Scanflex Multiplexor is mounted in an IP65 polycarbonate enclosure with a clear lid. (See
Page 59)
The Multiplexor controls the setting of a relay to select the transducer (and temperature sensor)
for the required measurement point. The transducer currently connected to the controller is
identified by an illuminated red l.e.d. adjacent to the energised relay.
The module is fitted with an RS485 serial port for communications with the controller. The
controller transmits data every half second when in the measurement mode. When a valid
message is received, the green 'comms' l.e.d. will flash.
The selector switch (SW1) marked 'UNIT' is used to select the number that uniquely identifies the
module to the controller. For the Multiplexor, settings must always be 1. If the switch is set to
zero the module can be tested using the momentary switches SW2 and SW3. By pressing 'TEST
1' (SW2) the relays are energised rapidly in sequence, while 'TEST 2' (SW3) is pressed to
energise the next relay in the sequence. To exit from the test condition move the selector switch
(SW1) away from zero.
The module is fitted with two part screw terminal connectors for ease of wiring, with separate
connectors for each point. A full description of the connections is shown on Page 60.
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