Article 168517 of comp.os.vms:
Glenn,

I also use a Decserver 200.  For what it's worth here are some detailed
templates showing how I set up a DECSERVER 200 port and the settings for
a USRobotics 28.8 to connect to VAX/VMS.  You never know, you may be
able to map this info to make a configuration in your environment work. 
I'd be very interested in what your final solution turns out to be:  

                         USR Sportster 28.8 Modem Setup 
                        For Dial-in/out to and from VAX 
                                 February
1995                                           
Modem Dip Switch Settings 
 
1 - UP   (or OFF) 
2 - UP   (or OFF) 
3 - DOWN (or ON) 
4 - UP   (or OFF) 
5 - UP   (or OFF) 
6 - UP   (or OFF) 
7 - UP   (or OFF) 
8 - DOWN (or ON) 
  
Modem Settings 

USRobotics Sportster 28800 V.34 Fax Settings... 
 
   B0  E1  F1  M1  Q0  V1  X4  Y0 
   BAUD=4800   PARITY=N  WORDLEN=8 
   DIAL=PULSE  ON HOOK 
 
   &A1  &B0  &C1  &D2  &G0  &H1  &I0  &K1 
   &M4  &N0  &P0  &R1  &S1  &T5  &U0  &Y1   
 
   S00=001  S01=000  S02=043  S03=013  S04=010  S05=008  S06=002   
   S07=060  S08=002  S09=006  S10=007  S11=070  S12=050  S13=000   
   S14=001  S15=000  S16=000  S17=000  S18=000  S19=000  S20=000   
   S21=010  S22=017  S23=019  S24=000  S25=005  S26=000  S27=000   
   S28=008  S29=020  S30=000  S31=000  S32=000  S33=000  S34=000   
   S35=000  S36=014  S37=000  S38=000  S39=000  S40=000  S41=000   
   S42=000  S43=200  S44=015  S45=000  S46=000  S47=000  S48=000   
   S49=000  S50=000  S51=000  S52=000  S53=000  S54=096  S55=000   
   S56=000  S57=000   

Dial In/Out Port - Decserver 200 Setup 
 
Port n:                                Server: xxxxxx 
 
Character Size:            8           Input Speed:        4800 
Flow Control:            XON           Output Speed:       4800 
Parity:                 None           Modem Control:   Enabled 
 
Access:              Dynamic           Local Switch:       None 
Backwards Switch:       None           Name:             PORT_n 
Break:                 Local           Session Limit:         1 
Forwards Switch:        None           Type:               Soft 
 
Dedicated Service: xxxxxx 
 
Authorized Groups:    0    
(Current)  Groups:    0  
 
Enabled Characteristics: 
 
Autobaud,  Autoconnect,  Autoprompt,  Broadcast,  Dialup,  DSRlogout, 
DTRwait,  Inactivity Logout,  Input Flow Control,  Limited View, 
Loss Notification,  Message Codes,  Output Flow Control, 
Remote Modification,  Security,  Signal Check,  Verification 
 
Dial In/Out LAT Setup on VMS side template: 
 
$ MCR LATCP 
LATCP> CREATE PORT LTAx: /NOLOG 
LATCP> SET PORT LTAx: /APPLICATION /NODE=xxxxxx /NOLOG /PORT=PORT_x 
 
Dial Out VMS Terminal Setup template:  
 
$! 
$! Modem port 
$! 
$ SET TERMINAL LTAx: /PERM /DEVICE=Unknown /WIDTH=80 /PAGE=24 /WRAP - 
                     /LOWERCASE /BROADCAST /LINE_EDITING /SPEED=9600 - 
                     /DIALUP /FORM /AUTOBAUD /ALTYPEAHD /ANSI_CRT - 
                     /EDIT_MODE
/DISCONNECT/EIGHT_BIT/TAB/PASTHRU/TTSYNC  

Ensure the terminal characteristics look as follows for dialout:
 
Terminal: _LTAx:      Device_Type: Unknown       Owner: No Owner 
 
   Input:   9600      LFfill:  0      Width:  80      Parity: None 
   Output:  9600      CRfill:  0      Page:   24       
 
Terminal Characteristics: 
   Interactive        Echo               Type_ahead         No Escape 
   No Hostsync        TTsync             Lowercase          Tab 
   Wrap               Scope              No Remote          Eightbit 
   Broadcast          No Readsync        Form               Fulldup 
   No Modem           No Local_echo      Autobaud           Hangup 
   No Brdcstmbx       No DMA             Altypeahd          Set_speed 
   No Commsync        Line Editing       Overstrike editing No Fallback 
   Dialup             No Secure server   Disconnect         Pasthru 
   No Syspassword     No SIXEL Graphics  No Soft Characters No Printer
Port 
   Numeric Keypad     ANSI_CRT           No Regis           No
Block_mode 
   No Advanced_video  Edit_mode          No DEC_CRT         No DEC_CRT2 
   No DEC_CRT3        No DEC_CRT4        VMS Style Input 
 
Good Luck,

M.Green