Communication; Interfaces; Optical Interface As Per Iec 62056-21 On The Front Panel; Electrical Interface - RMG EC 900 Operating Instructions Manual

CONSTRUCTION AND FUNCTION
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Communication

Interfaces

Optical interface as per IEC 62056-21 on the front panel

The M900 (default setting, required for the Dialog 900 operating software), Modbus RTU and Mod-
bus ASCII protocols have been implemented for the optical interface. This interface is mainly used
to parameterize the corrector. In addition, all archive data can also be read out (Dialog program or
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MDA). The interface is available in identical form on the corrector and the communication unit. If
the data is called via a PC, the PC program must be able to enable the RTS or DTR control line in
order to establish communication with the EC 900 via the read head.

Electrical interface

Alternatively, an RS 232, RS 422 or RS 485 interface is available as interface for remote data
transmission. In the case of devices for Ex zone 1, this interface is provided by the main unit (MU).
In the case of devices for Ex zone 2, the internal communication unit (CU) provides this interface.
The MU and CU exchange their data via an internal bus. Moreover, an external CU can be connect-
ed to the devices for Ex zone 1 which will also exchange its data with the MU via the internal bus.
A modem can be installed either internally or externally. The internal modem version is connected
via the RS 232 interface. However, it is basically also possible to connect an external third-party
modem through this interface.
The RS 485 interface can also be used as a direct Modbus interface for point-to-point connections.

Modems

Modems can be operated as follows in conjunction with the EC 900:
Internal mode
This variant is only possible for Ex zone 2 and also conditional on an internal power pack being
used.
External mode via RS 232 (intended), separate device required
This variant is also possible for Ex zone 2; it is necessary to connect third-party modems.
The standard solution for Ex zone 1 provides for applications with an external modem.
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