Black Box Server LES431A User Manual download pdf (Page 13)

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Chapter 3: Installation and Initial Setup

If you select RS-232 mode when you configure the Modbus Hardened Serial Server, you must connect the Modbus serial network

to the Modbus Hardened Serial Server via a serial cable. The LES431A is a DTE. If the Modbus network is a DTE, use a null-

modem (crossover) cable. If the Modbus network is a DCE, use a straight-through cable. DTE and DCE ports are complementary;

the output signals on a DTE port are inputs to a DCE port, and output signals on a DCE port are inputs to a DTE port. The signal

names match each other and connect pin-for-pin. Signal flow is in the direction of the arrows (see Table 3-1, below).

Table 3-1. DTE to DCE Connections.

DTE Device (Computer) DB9 DCE Device (Modem) DB9

Pin # RS-232 Signal Names Signal Direction Pin # RS-232 Signal Names

1 Carrier Detect (CDA) <---------------------------- 1 Carrier Detect (CD)

2 Receive Data (RX) <---------------------------- 2 Receive Data (RX)

3 Transmit Data (TX) ----------------------------> 3 Transmit Data (TX)

4 Data Terminal Ready (DTR) ----------------------------> 4 Data Terminal Ready (DTR)

5 Signal Ground (SG) ----------------------------- 5 Signal Ground (SG)

6 Data Set Ready (DSR) <---------------------------- 6 Data Set Ready (DSR)

7 Request to Send (RTS) ----------------------------> 7 Request to Send (RTS)

8 Clear to Send (CTS) <---------------------------- 8 Clear to Send (CTS)

9 Ring Indicator (RI) <---------------------------- 9 Ring Indicator (RI)

Soldered to DB9 metal—Shield (FGND) ----------------------------- Soldered to DB9 metal—Shield (FGND)

If you select RS-422 mode, RS-485 2-wire mode, or RS-485 4-wire mode when you configure the Modbus Hardened Serial

Server, you must connect the Modbus network appropriately, via the 5-position terminal block.

NOTE: Refer to Appendix B for connector pinout information.

Diagram Format

Rule Size: 0.013

Serial device

RS-232 serial cable

Network

RS-422/485 cable

Modbus

Hardened Serial

Server (LES431A)

Figure 3-2. LES431A connections.

3.3 Connecting Modbus Hardened Serial Servers to a Network

When connecting a Modbus Hardened Serial Server equipped with a 10BASE-T/100BASE-TX network connection (RJ-45

connector) to an Ethernet network drop, use a standard unshielded twisted-pair cable. PCs configuring and/or communicating

with the Modbus Hardened Serial Server are also connected to the network.

3.4 Modbus Hardened Serial Server Configuration Connections

The Modbus Hardened Serial Servers can be configured using three methods:

• Via the network using Modbus Hardened Serial Server Software.

• Via the network using a Web browser.

• Via a serial port using Modbus Hardened Serial Server Software (Console Mode).

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