User manual

14
WARNINGS:
1. Hera relay outputs are current limited to 60mA. Some
electromechanical relays or contactors may require larger
pull-in current to be activated. In such situation, a smaller
relay, requiring less pull-in current shall be wired between
the Hera and the contactor. We recommend the use of
solid-state relays which require very small pull-in and
holding currents.
2. Under no circumstances should mains AC voltage be
plugged into these outputs !
CONNECTION WITH A PC
Connection to a PC allows data stored in the Hera’s memory to
be recovered. The connection is made using a RS-232 serial
port on the PC.
Depending on the hardware revision of your Hera, you will be
able to use a standard straight serial cable or you will need to
make one by yourself.
Hera’s manufactured from March 2008 have a female 9-pin
D-Sub connector for serial connection. With those Hera,
you can use a standard pin-to-pin serial male / female
cable.
Older devices have a male 9-pin D-Sub connector and
require a costume made cable. It requires a 3 conductor
cable with a female 9-pin D-Sub connector on both end, wired
as follow:
Hera side PC side
Sub-D 9 female Sub-D 9 female
pin 1 ground pin 5
pin 3 data pin 3
pin 4 data pin 2
COMMENTS:
1.This cable is specially for the Apex Hera and therefore
cannot be found in any computer shop.
2.This cable is not reversible. One side is for the Hera and
the other for the PC. Connect the Hera side into the Hera
serial port (see rear panel diagram) and the PC side into
an unused RS-232 port on the PC.
Most of today’s PC and laptop don’t have a serial port.
Nevertheless inexpensive USB to RS-232 converters are
available in any computer shop.
It is also possible to interconnect the Hera with a PC using
Ethernet network. A whitepaper detailing this topic is available
on the Apex website.
CONNECTION WITH THE APEX LETO
The Leto large display provides a copy of the LED sound level
display of the Hera for use at a remote location.
The optional Leto display is connected to Hera using a supplied
RJ-12 cable. This cable length is limited to just a few meters (see
the Leto user manual for more information).If longer distances
between Leto and Hera are required, then the optional Leto
Extender kit can be purchased.
Using the Extender kit enables cable lengths up to 200 m to
be used. The kit consists of one transmitter and one receiver
unit and standard RJ-45 FTP network cable should be used to
connect the two together (cable not supplied). Be aware that
this signal does not conform in any way to Ethernet standards !
A maximum of two Leto displays may be slaved to the Hera by
daisy-chaining two receiver units together.
Connecting Leto and Extenders