Applied Systems Engineering Bell-202T Bedienungsanleitung PDF herunterladen (Seite 9)

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Page 5

Power Connection

View the end of the board with the RJ-11 connector at your left and the three-position power connector at

your right. The three power connector pins are as follows:

Location Pin Label Description

Leftmost 1 + Power Positive

Middle 2 - Power Negative (return)

Rightmost 3 S Earth ground (not normally used)

RJ-11 Cabling

The standard RJ-11 jack terminates in 4 spade lugs. The following table contains the cabling options for

both 4-wire and 2-wire operation.

RJ-11 Cable 4-wire mode (full duplex) 2-wire mode (half duplex)

Red

Green

Transmit Transmit/Receive

Yellow

Black

Receive Unused

RS-232 Cabling

The following table itemizes RS-232 pins utilized. Pins not listed are not used.

Pin Description Pin Description

1 Frame Ground 5 Clear To Send (CTS)

2 Transmit Data (TD) 7 Signal Ground

3 Receive Data (RD) 8 Carrier detect (CD)

4 Request To Send (RTS)

Common Problems and Solutions

Description of Problem Recommended Solution

Messages sent by the ASE modem are

not received at the other modem

Make sure that the RTS/CTS time (SW4) on the ASE modem

is longer than the carrier detect time on the other modem.

Messages sent by another modem are not

received at the ASE modem

Make sure that the RTS/CTS time on the other modem is

longer than the “CD On Delay” time (SW3) on the ASE

modem.

Frequent communication errors in

messages received at non-ASE modem

The ASE modem supports two methods for disabling the

carrier, selected by the jumper at JP6. Try the alternate setting.

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Applied Systems Engineering Bell-202T Bedienungsanleitung Seite 9