RMG EC 900 Operating Instructions Manual page 10

INTRODUCTION
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Type Ex zone Equipment
EC 911
EC 912
2
EC 921
EC 922
There are the following external modules available:
Type
CU 900
ISS 900
ISS Batt
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1 Volume corrector with data-
logging function
1 + external CU 900 communi-
cation module (or external
ISS 900 power supply mod-
ule)
2 + internal communication
module
+ optional external ISS Batt
battery module
2 + internal communication
module
+ power pack (24 VDC or
230 VAC)
Designation
Communication module
Power supply module
Battery module
Functions and features
Supplied by 1 internal battery
Volume pulses: 2 x reed or Wiegand
Externally supplied plus emergency battery
Volume pulses: 2 x reed, NAMUR or Wiegand
Modem and interfaces in the external CU 900 com-
munication module
Supplied by 2 internal batteries
Volume pulses: 2 x reed or Wiegand
Internal modem
Externally supplied plus emergency battery for the
volume corrector
Volume pulses: 2 x reed, NAMUR or Wiegand
Internal modem
Functions and features
Intrinsically safe power supply of the EC 900
4 analogue outputs
2 data interfaces (1x RS 232, 1x RS 422/485 or Ethernet)
Intrinsically safe power supply of the EC 900
Electrical isolation for the interface (RS 232/422)
Supplying the EC 900 for Ex zone 2 (12–20 VDC)