Westermo IDW-90 AT - Manual (Page 17)

17 6620-3200
! +MS – Modulation Selection
This command parameter controls the manner of operation of the modulation capabili-
ties in the modem. It accepts six sub parameters:
AT!+MS=[<carrier>[,<automode>[,<min_tx_rate>[,<max_tx_rate>[,<min_rx_rate>
[,<max_rx_rate>]]]]]]
Where: Possible <carrier>, <min_tx_rate>, <max_tx_rate>, <min_rx_rate>, and <max_rx_
rate> values are listed below.
!+MS Command Supported Rates
Modulation <carrier> Possible (<min_rx_rate>, <max_rx_rate>, (<min_tx_rate>)
and <max_tx_rate>) Rates (bit/s)
Bell 103 B103 300
Bell 212 B212 1 200 Rx/75 Tx or 75 Rx/1 200 Tx
V.21 V21 300
V.22 V22 1 200
V.22 bis V22B 2 400 or 1 200
V.23 V23C 1 200
V.32 V32 9 600 or 4 800
V.32 bis V32B 14 400, 12 000, 9 600, 7 200 or 4 800
V.34 V34 33 600, 31 200, 28 800, 26 400, 24 000, 21 600, 19 200, 16 800,
14 400, 12 000, 9 000, 7 200, 4 800 or 2 400
Defined Values
<carrier> A string which specifies the preferred modem carrier to use in
originating or answering a connection. <carrier> values are strings
of up to eight characters, consisting only of numeric digits and
upper case letters.
<carrier> values for ITU standard modulations take the form:
<letter><1-4 digits><other letters as needed>.
<automode> A numeric value which enables or disables automatic modulation
negotiation (e.g., ITU-T V.32 bis Annex A or V.8).
0 = Automode disabled.
1 = Automode enabled. (default)
<min_rx_rate> Numeric values which specify the lowest (<min_rx_rate>) and
and highest rate at which the modem may establish a receive connection.
<max_rx_rate> May be used to condition distinct limits for the receive direction as
distinct from the transmit direction. Values for this sub parameter
are decimal encoded, in units of bit/s. The possible values for each
modulation are listed in Table 1.
Actual values will be limited to possible values corresponding to
the entered <carrier> and fall-back <carrier> as determined during
operation. (default = lowest (<min_rx_rate>) and highest (<max_
rx_rate>) rate supported by the selected carrier.