Multi-Tech ISIHI-2S Specifikace stáhnout pdf (Strana 83)

MultiModem ISI Hybrid Series, ISIHI-2S/2U 83

Chapter 4—MODEM AT Commands, S-Registers, Result Codes

Modem S-Registers

S-registers are small regions of memory where modem configuration information is

stored. Whereas AT commands tell a modem what to do, S-registers tell the modem how

to do it. Each S-register has a name that consists of the letter S and a number (S0, S1, S2,

etc.), hence the term S-register. Use the Sr? command to read the value stored in an S-

S0 Number of Rings Until Modem Answers

Unit: 1 ring

Range: 0255

Default: 0

Defines number of rings the modem waits before answering an incoming call. Default

value is zero, which effectively disables the auto-answer function. When auto-answer is

disabled, the modem can only answer via the ATA command. Set the S0 register value to

one to cause the modem to answer the call immediately after the first ring. Maximum

number of rings that can be configured is 255.

S1 Ring Count

Unit: 1 ring

Range: 0255

Default: 0

Counts number of rings that have occurred. It is a read type of register and is seldom used

in typical operation. Each time an incoming ring signal is detected, S1 increases its value

by one, up to a maximum of 255. If you set S1 to a value other than its default value of

zero, or if the value is increasing with rings, this new value remains stored in S1 for eight

seconds after the last ring is counted, after which the value reverts back to zero.

S2 Escape Code Character

Unit: Decimal

Range: 0255

Default: 43 (+)

Defines escape code character by its decimal ASCII code. Default character is the plus (+)

sign (decimal 43). S2 can be set for any ASCII character. Setting an S2 value greater than

127 results in no escape character, resulting in no means of entering command mode from

online mode without breaking the online connection unless you use the BREAK method.

Note: If you change the S2 value, you must make corresponding changes in your data

communications software.

S3 Return Character

Unit: Decimal

Range: 0127

Default: 13 (^M)

Defines carriage return character by its decimal ASCII code. Default setting is the ^M

character (decimal 13), the code for ENTER on most keyboards. Can be set for any ASCII

character.

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Multi-Tech ISIHI-2S Specifikace Strana 83