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The default asynchronous handling of data to be transmitted to the remote pier is 8 data bits, 1 stop bit and no
parity. Asynchronous character handling can be configured to support any combination of the following:
7 or 8 data bits,
1 or 2 stop bits, and
No, Even, Odd, Space, Mark parity
The modem will perform parity insertion on transmission. The modem will not parity check the receive data but
will pass the parity bit or stop bit to the host if it occupies the eighth bit position. For eight bits with parity the
parity bit is not delivered to the host.
Three indexes are used to configure the asynchronous data format. Asynchronous data formats are not
automatically detected. These parameters must be configured by the host prior to each call.
DATA BITS
Index 252 Default = 8
This Index determines the number of data bits when connected in an asynchronous POS mode. The possible
settings are 7 or 8 data bits. The default setting is 8 data bits.
STOP BITS
Index 172 Default = 1
This index determines the number of stop bits when connected in an asynchronous POS mode. The possible
settings are 1 or 2 stop bits. The default setting is 1 stop bit.
PARITY
Index 219 Default = 0 (No Parity)
This index determines the parity of the data when connected in an asynchronous POS mode. The possible
settings are as follows.
No Parity = 0
Even Parity = 1
Space Parity = 3
For Example: to configure the modem to use 7 Data Bits, 1 Stop Bit and Even Parity, issue:
AT:m252=7:m172=1:m219=1
Data Modem Commands:
Modulation Strap
This index selects a specific modulation (data modem analog protocol), limiting the physical connection to the
advertised speed/protocol or slower. When the Modulation Strap is set to None, all supported analog protocols
are advertised.
ModulationStrap NONE = 0,
ModulationStrap V90 = 1,
ModulationStrap K56 = 2,
ModulationStrap V34BIS_V34 = 3,
ModulationStrap V32BIS_V32 = 4,
ModulationStrap V22BIS_V22 = 5,
ModulationStrap V23 = 6,
ModulationStrap V21 = 7,
ModulationStrap BELL212_BELL103 = 8,
ModulationStrap H324_V34 = 9,
ModulationStrap H324_V90 = 10,
ModulationStrap BELL103 = 11,
ModulationStrap V22 = 12,
MultiAccess Communications Server MA30120 User Guide
Odd Parity = 2
Mark Parity = 4
Index 256 Default = 0 (None)
Appendix B – Modem Commands
154
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