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Joined: Aug 2009
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bates57 Offline OP
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I need the AT commands for setting up a robotics 56K faxmodem to a SX2000 maintenance port. Switch settings on the modem are 1,2,4 down, but I do not remember the (AT&?) commands when setting up the modem for the first time.

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Joined: Sep 2008
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I set it up by connecting to the modem at 9600 baud and enter AT&B1, AT&W0, AT&W1 and then change settings of the switches all up except 3 and 8 down and power down and up to read the switches. I also use a full null modem cable with those settings.

Joined: May 2005
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I use the below doc, works on 200 or 2k,

The following cabling and AT command set are to be used when connecting an AT command compatible modem to the SX200 ICP. Our examples use USR 33.6 and V.92 modems. If you have a different modem that supports the AT command set, consult your modem manufacturer to determine the correct equivalent settings for that modem.

Step 1: Verify your USR 33.6 or V.92 modem register bits are setup as follows. To determine the modem's current settings, connect the modem to a laptop at 9600 8N1 with a straight through cable. Before powering on the modem, set dip switches 1,3 and 8 down, the rest of them up.
Type ati4 <enter>
USR 56K V.92 FAX modem settings:
Start by doing at&f which will default modem then match below
B0 E1 F1 M1 Q0 V1 X1 Y0
BAUD=9600 PARITY=N WORDLEN=8
DIAL=TONE ON HOOK CID=0

&A1 &B0 &C1 &D0 &G0 &H0 &I0 &K1
&M4 &N6 &P0 &R1 &S0 &T5 &U0 &Y1

S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002
S07=060 S08=002 S09=006 S10=014 S11=070 S12=050 S13=000
S15=000 S16=000 S18=010 S19=000 S21=010 S22=017 S23=019
S25=005 S27=000 S28=008 S29=020 S30=000 S31=128 S32=002
S33=000 S34=000 S35=000 S36=014 S38=000 S39=000 S40=001
S41=000 S42=000
Step 2: To alter the register, type the command prefix at, followed by the register letter and desired value. For example, if the modem had register f set to 0, register x set to 4 and register &N set to 0, those registers need to change.
You can change each register individually:
atf1 <enter>
atx1 <enter>
at&n6 <enter>
or combine the necessary changes into one command:

atf1x1&n6 <enter>
Then the changes must be saved to the modem's memory:
at&w0 <enter>
Then type ati4 again to confirm the changes were made.
When confirmed, power off the modem, set switches 1 and 4 down, the rest of them up.

Step 3: Verify the cable to be used between the ICP and the modem. Two cables have been tested with the USR 33.6 and V.92 modems.

Cable Number 1: (If this cable is used, and garbage is seen, then clip pin 8 on the DB25 side.)

DB 9 DB25 the color are the wires in each rj45 to connectors

1 -------Blue------------- 20
2 ------red-------------- 2
3 -------green ------------- 3
4 ------orange-------------- 6
5 -------yellow------------- 7
6 --------white------------ open
7 --------brown------------ 5
8 --------black------------ 4
9 -------------------- open


Alex Kroger
Pinnacle Communications Corp
Mitel/Hitachi
Nationwide Hospitality Provider

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