Serial Interface RS485
Connection Terminal side, 9-pin D-sub socket
Protocol Refer to 13.2.5.1 Communication Serial
Baud rate (adjustable) Modbus RTU (optional):
Min. 1200 bit/s
Max. 115 200 bit/s
IEC 60870-5-103 (optional):
Min. 9600 bit/s
Max. 38 400 bit/s
Maximum distance of transmission Max. 1 km
(depending on transmission rate)
Transmission level Low: -5 V to -1.5 V
High: +1.5 V to +5 V
Reception level Low: ≤ -0.2 V
High: ≥ +0.2 V
Bus termination Not integrated, bus termination using plugs with inte-
grated bus terminating resistors.
Pin No. Assignment
1 Shield
2 Not assigned
3 A
RS485 connection pin A
4 Not assigned
5 GND
(towards DC +5 V)
6 DC +5 V
Supply voltage for terminating resistors (max. 100 mA)
7 RTS
Direction control
(if required for an external conversion)
8 B
RS485 connection pin B
9 Not assigned
Environmental Conditions and Climatic Stress Tests
Environmental Conditions
Temperature data
Operating temperature
Devices with display: the legibility
of the display is impaired at
temperatures < 0 °C (+32 °F)
-25 °C to +55 °C
-13 °F to +131 °F
Temperature during transport -40 °C to +70 °C
-40 °F to +158 °F
Temperature during storage -40 °C to +70 °C
-40 °F to +158 °F
Maximum temperature gradient 20 K/h
12.1.4
Technical Data
12.1 Technical Data
248 SICAM, SICAM P850/P855 7KG85X, Manual
E50417-H1040-C482-A9, Edition 03.2022
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