1200 BPS DCM-212 Modem (260-1385)      Registers       Faxback Doc. # 5959

Registers are used to store the parameters that control communications. Each
register has variables that determine how the modem operates or supplies
information on the modem's current condition. The DCM-212's 15 registers and
the default values are shown in Table 6.

Register S0 defines the ringing signals before a call is answered, register
S1 counts the rings, registers S2-S5 define the function key characters,
registers S-6-S12 are used to control function time, and register S16 is for
the self-test. S13 is the bit-mapped register. With the exception of the
last bit register, you can read the current value of a register or assign a
new value to match the registers to your particular environment by using the
command syntax.

COMMAND SYNTAX

Sx? Check the register value

Use this syntax to check register values. The value of each register is
displayed on the screen in decimal numbers in the range 0-255. For example,
to check the value of register S0, type:  AT S0? <ENTER>

On the screen, you will see:

              000
              OK

You can also check the values of more than one register in the same command
line. To check the values of register S0 and register S7, type: AT S0?
<ENTER> 

The screen might show:

              000
              030
              OK
Sx=n Change the register value

Use this syntax to assign or change register values. To assign the value 3
to register S0, type:  AT S0=3 <ENTER>

After changing the value, the modem signals OK. Another syntax for changing
a register value is:

              AT S0 <ENTER>  Set the pointer to register S0.
              AT ?  <ENTER>  Read the value of S0
              AT=3  <ENTER>  Assign the new value 3 to S0.

For more information on the registers, refer to Appendix B, Hayes Protocol
Reference.

TABLE 6. REGISTERS

REGISTER RANGE   UNIT         FUNCTION                              DEFAULT

   S0    0-255    Ring        Defines the rings in answer mode         0*
   S1    0-255    Ring        Ring counter                             0
   S2    0-127    ASCII code  Defines escape code character            43
   S3    0-127    ASCII code  Defines CR code character                13
   S4    0-127    ASCII code  Defines LF code character                10
   S5    0-32,127 ASCII code  Defines BS code character                8
   S6    2-255    Seconds     Defines dial tone wait time              2
   S7    1-255    Seconds     Defines carrier wait time                30
   S8    0-255    Seconds     Defines pause duration for comma         2
                              (Although you can input a value
                              up to 255, the actual maximum
                              value is 54)
   S9    1-255    1/10 sec.   Defines carrier detect response time     6
   S10   1-255    1/10 sec.   Defines carrier loss time for hang up    7
   S11   50-255   Millisec.   Defines touch-tone dialing speed         70
   S12   20-255   1/50 sec.   Defines escape code guard time           50
   S13                        Bit-mapped register
   S14─┐                      Not Used
   S15─┘
   S16   0                    Self-test mode off                       0
         1                    Self-test mode on

* When DIP Switch 4 is on, the modem powers up in auto-answer mode with
  S0=1.

NOTE: The ASCII code values are expressed in decimal.

(dkh-08/05/93)