Promag CON-485 Series Operations Instructions download pdf (Page 56)

5 Operation / adjusting device settings - Set-up to commissioning Memo-Graph S

56 Endress+Hauser

5.9 Communication via serial interfaces / modem

5.9.1 RS 232

The RS 232 serial interface can be accessed from the front (3.5 mm stereo jack plug under the ATA

flash drive) (not available for stainless steel front) and from the rear (9 pin Sub-D socket).

Caution!

• Simultaneously using the front and the rear-mounted RS 232 is not permitted. Device malfunc-

tion.

• Only the front-mounted interface with die-cast front (IP 54) with a door can be accessed, and not

the version with stainless steel front.

5.9.2 RS 485

This interface (option) can be accessed alternatively at the rear side interface. The RS 485 can be

used for remote configuration/readout (up to approx. 1000 m lead length).

Caution!

When using an RS 232 / RS 485 converter, ensure that it supports automatic change over between

sending and receiving (e.g. W+T type 86000).

5.9.3 PROFIBUS DP

When connecting to PROFIBUS DP, you can display, record and monitor measured values. These

measuring points are treated as conventionally-wired analogue signals.

Both PROFIBUS DP and conventionally-connected measuring points can be used simultaneously

with one device, since the input signal for each channel is selected separately. A total of up to 16

measuring points are available per device (plus the digital inputs and mathematics channels).

“Monitor” operating mode:

A master (e.g. existing control system) interrogates the connected slaves without affecting the sys-

tem itself. Physically, the RS 485 interface is used (Baudrate 93.750 kBit/s, alternatively 45.45

kBaud, fixed).

The measurement data from the slaves is analysed. For this, the slave address and data format setting

is required for each channel (see “Set-up - Analogue inputs - Channel xx - PROFIBUS DP”).

Please refer to your transmitter's specifications/data here. If a slave delivers several measured data

sets (multiparameter transmitter/“modular slave”), each set of information requires its own chan-

nel.

Note!

• In order to be displayed correctly, the true, physical measured values (e.g. in °C, bar...) must be

transferred. Scaling at the device is not possible.

• Please ensure that connections that are not used are also not switched on at the plug.

• PROFIBUS PA devices can be used via the PA/DP bus coupler (“Segment coupler”).

• PROFIBUS measuring points can be calculated with each other and with conventionally connec-

ted analogue measuring points in mathematics module.

“Slave” operating mode:

Slave functions in combination with Profibus coupler (Accessories: RSG12A-P1). Insert for bi-direc-

tional communication in cyclic data transfer.

Baudrate: max. 12 Mbaud, adjustable.

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Promag CON-485 Series Operations Instructions Page 56

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