User manual

INSTALLATION

Section 2

2-4

Table 2.1 Front Panel Indicator Names and Functions.

Name Function Colour Status

TD Transmit Data Yellow Off for mark, On for space, flickering for data

RD Receive Data Yellow Off for mark, On for space, flickering for data

CD Carrier Detect Green On when CD active, Off when CD inactive.

(See AT&C command)

OH Off Hook Red On when modem is on line (Off hook). Off

when modem is off line (On-hook).

When the modem is in Loop modes this LED

flashes.

2.5 Testing Your Connections

With your terminal or computer connected and operating, the DTR LED should light. You

can now perform a quick test to determine if you have setup the DPX-213 correctly.

After connecting your terminal or PC to the modem, power the system up and start your

communications or terminal emulation package. To check that keyboard characters are

reaching the DPX-213, the TD LED must flash with every keystroke.

Press the

key. Each time you press the key, the TD LED should flash briefly. If no

data is reaching the DPX-213, check that:

1. The correct COM port is being used on your PC;

2. The terminal is in the ON-LINE state and not the LOCAL Mode state, or,

3. The correct cable is being used and the cable pinouts are correct.

2.6 Setting Your PC for Speed and Character Format

The DPX-213 uses the attention request ('AT' prefix) to automatically detect terminal

speeds at all standard baud rates up to 9,600 baud.

For initial configuration, the terminal used must be a ten bit ASCII device operating at one

of the standard speeds, for example, 300, 1200, 2400, 4800, 9600 or 19,200 bps. The AT

command processor and Constant Speed Interface accept character formats of 10 bits in

total.

For example: