Applied Systems Engineering Bell-202T Manuel d'utilisateur télécharger pdf (Page 3)

ASE DC-Powered Bell-202 Modem

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Jumper Settings for Box Mount (5006) Modem

Bold indicates factory settings

Jumper Usage Notes Jumper Meaning

1-2 DSR

JP1 DTR/DSR

• Uses DTR as “clear-to-send” signal, instead of CTS

• Uses DSR as “request-to-send” signal instead of RTS

• Normal mode (RTS/CTS) has no jumpers installed

3-4 DTR

1-2 -45 dB JP2 Receiver

gain

• Sets receiver gain to –35 or –45 dB

• Exactly one jumper must be installed

3-4 -35 dB

JP3 Receiver

squelch

• For half duplex mode, adds 156 millisecond delay between

end of transmitted message and enabling receiver

• Receiver constantly enabled if not installed

1-2 156 msec

1-2

3-4

2-wire

5-6

JP4 2W/4W

• Selects 2-wire (half duplex) or 4-wire (full-duplex)

operation

• Exactly 2 jumpers must be installed

7-8

4-wire

JP5 Carrier

• Selects switched or constant carrier

• Remove jumper for switched carrier

1-2 Constant

JP6 900Hz

turn-off

• Installed deactivates 900Hz transmit on incoming carrier

detect or at end of transmit time (SW3)

• Removed maintains 900Hz through end of transmit time

(SW3) regardless of incoming carrier

1-2 Installed

JP7 Transmit

level range

selection

• If installed, SW1 settings interpreted as 0 to –15 dB

• If removed, SW1 settings interpreted as –16 to –31 dB

1-2 Installed

3-5

4-6

Enable

1-3

JP9 Soft-carrier

enable

• Enables/disables 900Hz shut-off. Currently, the 900Hz

shutoff must be selected

2-4

Disable

1 2 3

- 2 2
- 3 3

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Applied Systems Engineering Bell-202T Manuel d'utilisateur Page 3

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