Multitech MultiModem DSVD MT5600DSVD Instruction Manual download pdf (Page 20)

10 Assembling the SmartServer Hardware

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 L

ONWORKS Network Connection

17 LON

B/PLT + TP/FT-10 twisted pair

18 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 Freely Programmable Module [FPM] driver) to the RS-232 serial

port. Note that the RS-232 serial port supports only one of the aforementioned items 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 should use a suitable shielded cable when connecting

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

an FPM driver) to the RS-485 port. Note that the RS-485 port supports only one of the aforementioned

items at a time.

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

SmartServer.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 34 35

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Multitech MultiModem DSVD MT5600DSVD Instruction Manual Page 20