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Chapter 3: Installation and Setup
3. Installation and Initial Setup
This section describes how to install the Hardened Serial Server and configure the device.
NOTE: In this section, devices to be connected to the Hardened Serial Server’s serial connections are simply referred to as the “serial
device.”
3.1 Connecting the Power Supply
Connect a DC power supply to the power terminals on the side of the Hardened Serial Server. Polarity of the wires is indicated under-
neath each connector. Acceptable voltages are between 10 VDC and 58 VDC. The power supply must be capable of
supplying 4 watts for the LES421A or LES422A or 6 watts for the LES424A.
Figure 3-1. LES421A, LES422A, and LES424A power supply connections.
3.2 Connecting Hardened Serial Servers to Serial Devices
The Hardened Serial Servers can be connected to serial devices using RS-232, RS-422, RS-485 2-wire, or RS-485 4-wire
communication. LES422A and LES424A models use (2) or (4) DB9 M connectors. LES421A models use either (1) DB9 M connector or (1)
5-position terminal strip.
3.2.1 RS-232
The 2- and 4-port models, along with the 1-port model when using its DB9M connector, support seven RS-232 signal lines (TD, RD,
DTR, DSR, RTS, CTS, DCD) plus Signal Ground.
The 1-port model, when using its 5-position pluggable terminal block, supports four signal lines (TD, RD, RTS, CTS) plus Signal Ground.
NOTE: Only one connector (DB9M or 5-position terminal block) can be used on the LES421A.
Signals are single-ended and referenced to Signal Ground. Default communications parameters are 9600, 8, N, 1 (9600 baud,
8 data bits, no parity, 1 stop bit), and no flow control.
NOTE: The LES421A, LES422A, and LES424A are configured as DTEs. If they are connected to a computer or other DTE device, use a
null-modem (crossover) cable. If the serial device is configured as a DCE, use a straight-through cable.
Содержание LES421A
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