Echelon SmartServer 2.2 Hardware Instrukcja Użytkownika Pobierz pdf (Strona 22)

The following table lists the enclosure markings for the L

ONWORKS network screw terminals on the

SmartServer and their connection type.

Screw Terminal

Enclosure Marking

ORKS

Network Connection

LON

B/PLT +

TP/FT-10 twisted pair

LON

A/PLT -

TP/FT-10 twisted pair

RS-232/RS-485 Serial Ports

The SmartServer includes one RS-232 serial port and one isolated RS-485 multi-drop bus port. The

RS-232 serial connection is implemented on screw terminals 21–25. These connections are

polarity-sensitive. You can connect an external GSM modem, M-Bus devices, Modbus devices, or

legacy/nonnative devices (requires a custom driver) to the RS-232 serial port. The RS-232 serial port

supports only one device at a time.

The RS-485 bus connection is implemented on screw terminals 25–28. These connections are

polarity-sensitive: terminal 28 is marked positive (RT+), and terminal 27 is marked negative (RT-).

Do not reverse the polarity of the RS-485 port will because it will cause improper bus operation. The

RS-485 port picks up ground at terminal 25. The RS-485 connection is not susceptible to common

mode ground differential voltage swings, but you must use a suitable shielded cable when connecting

devices in noisy environments. You can connect Modbus devices or legacy/nonnative devices (requires

a custom driver) to the RS-485 port.

The following figure illustrates the location of the RS-232 and RS-485 screw terminals on the

SmartServer.

10 Assembling the SmartServer Hardware

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 36 37

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Echelon SmartServer 2.2 Hardware Instrukcja Użytkownika Strona 22