RMG EC 900 Operating Instructions Manual page 14

CONSTRUCTION AND FUNCTION
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Type EC 912
(Emergency) Battery
6
9 VDC
9 VDC
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Pressure transmitter
RS 422
interface
Ex zone 1
Safe area
ISS 900
24 VDC or
power supply isolator
115/230 VAC
RS 232 / RS 422
interface
alternatively
CU 900
Aerial
communication module
24 VDC or
Modem
115/230 VAC
Interfaces
1x RS 232 / USB
1x RS 422 / RS 485
1x Ethernet / modem / RS 232
The EC 912 version has been approved for
Ex zone 1 as an intrinsically safe device. The
boards of the EC 911 and EC 912 are identical
to each other; they differ in that the battery of
the externally supplied EC 912 serves only as
an emergency battery.
The EC 912 has two volume pulse inputs (reed
or Wiegand), one encoder input, one tamper
alarm input, and six digital outputs.
The device has an optical interface and an
electrical interface. The electrical interface
can be configured as an RS 232, RS 422 or
RS 485 interface using jumpers in the casing.
RS 422 is the default configuration (see also
page 32). Connection to the ISS 900 or
CU 900 via RS 422.
Depending on the power supply, there are dif-
ferent additional functions available:
ISS 900 power supply isolator:
The connection to the EC 912 serves not only
to power the device but also to transfer data.
The serial interface is now available on the
ISS 900 outside the Ex zone.
CU 900 communication module:
The serial interface is now available on the
CU 900. There is also another electrical inter-
face and an optical interface. The CU 900 can
be fitted with a fixed-line or radio modem; al-
ternatively, one of the interfaces can be con-
figured as a TCP/IP or USB interface. Fur-
thermore, there may be up to 4 analogue out-
puts.