Siebert SX102 Série Manuel D'utilisation page 30

Status indicators
The units have on the back side status indicators (LEDs) with the following meaning:
(except S102-06/18/0x-00x/0B-M0):
PWR The unit is supplied with voltage.
DATA Data transfer active (short flashing)
ERR Data transfer faulty (short flashing)
Control
The units must be parameterized before they can be controlled. Parameterization is
done in a menu (see 'Parameterization').
The units accept the Modbus RTU (Remote Terminal Unit) as an operation mode.
They are slaves in the sense of the Modbus over serial line specification and
implementation guide and support the code 16 (0x10) Write Multiple Registers
according to the Modbus application protocol specification.
The indications in the above mentioned documentation are to be observed. Both
documentations are available at 'www.modbus.org'.
For the Modbus control the RS485 interface is to be used. The RS232 interface is
determined for testing and not to be used as Modbus interface.
Attention! In the following diagrams SGD is the signal ground of the RS485
interface.
For the following units SGD corresponds to the COM terminal:
SX102-06/18/0x-00x/0B-M0
For the following units SGD corresponds to the GND terminal:
SX102-08/18/0x-00x/0B-M0
SX102-14/18/0x-00x/0B-M0
SX102-08/30/0x-00x/0B-M0
30
Character height 18 mm, 6 characters
Character height 18 mm, 8 characters
Character height 18 mm, 14 characters
Character height 30 mm, 8 characters
BAL SX102 MDB M 1.10