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6.4 Data interfaces
The data readout takes place according to 62056-21 via:
optical data interface D0
electrical data interface (RS232, RS485 or CL0)
raconet radio interface
6.4.1 Optical data interface D0
The D0-interface is designed according to IEC 62056-21 with Mode C. The following
baud rates can be set: 300, 1200, 2400 or 4800 baud.
6.4.2 Electrical data interface RS232
The electrical interface (galvanically de-coupled) is found at the additional terminals
under the sealable terminal cover (see connection diagram).
The electrical interface RS232 is a symmetrical two-wire interface designed according to
ITU-T V.24 and ITU-T V.28. The distance between the readout device and the meter
may not exceed 15 m.
Number of connected meters
Signal according to ITU-T V.28
logical “1”
- 3 V to - 15 V
logical “0”
+ 3 V to + 15 V
Table 3: Specifications of RS232
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