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S-Registers for the MT5656ZDX, MT5600ZDX, MT5600BA/BL-Series Modems

Multi-Tech Systems, Inc. Commands Reference Guide (PN S000273D)

S24 seconds 0–255 0 Sleep Inactivity Timer: Sets the number of seconds that the modem

operates in normal mode with no detected telephone or serial port

activity before it enters low-power sleep mode. The timer is reset upon

any serial port or telephone line activity.

S25 10ms (async) 0–255 5 Delay to DTR OFF: Sets the length of time that the modem

1 ms (sync) ignores DTR while taking the action specified by &D.

S26 10 ms 0–255 1 RTS to CTS Delay: When &R0 is commanded, sets the time after

detecting an OFF-to-ON transition on RTS before the modem turns CTS

ON. Applies to synchronous operation only.

S29 10 ms 0–255 70 On Hook Time: Sets the length of time that the modem goes on-hook

when it encounters a flash dial modifier (!) in the dialing string.

S30 10 ms 0, 1–255 0 Disonnect Inactivity Timer: Sets the length of time that the modem

waits before disconnecting when no data is sent or received. A value of

zero disables the timer. Applies to asynchronous operation only.

S36 decimal 0–7 7 LAPM Failure Control: Specifies the fallback action to take in the event

of an LAPM negotiation failure. These fallback options are initiated

immediately upon connection if S48 is set to 128. If an invalid number is

entered, S36 acts as if the default value has been entered. (See S48.)

0 Modem disconnects.

1 Modem stays online and a direct mode connection is established.

3 Modem stays on-line; normal mode connection established.

4 MNP connection is attempted. If it fails, modem disconnects.

5 MNP connection is attempted. If it fails, a direct mode connection is

established.

7 An MNP connection is attempted and if it fails, a normal modem

connection is established.

S38 seconds 0–254, 255 20 Delay Before Forced Hang Up: Sets the delay between the modem’s

receipt of the H command to disconnect (or high-to-low transition of DTR if

the modem is programmed to follow the signal) and the disconnect

operation. Applies only to error-correction connections. This register can

be used to ensure that data in the modem buffer is sent before the modem

disconnects. If S38 is set between 0 and 254, the modem waits for the

remote modem to acknowledge all data in the buffer before disconnecting.

If S38 is set to 255, the modem does not time out and continues to attempt

to deliver data in the buffer until the connection is lost or the data is

delivered.

S46 decimal 136, 138 138 Data Compression Control: Enables/disables data compression:

136 Error correction without compression.

138 Error correction with compression.

S48 decimal 0, 7, 128 7 V.42 Negotiation Control: Enables or disables LAPM negotiation. An

invalid value is treated as a 128 value.

0 Disables negotiation and proceeds with LAPM.

7 Enables negotiation.

128 Disables negotiation. Proceeds at once with the fallback action

specified in S36. Can be used to force MNP.

S86 decimal 0, 3–23 n/a Call Failure Reason Code: When the modem issues a NO CARRIER

result code, a value is written to this register to help determine the reason

for the failed connection. S86 records the first event that contributes to a

NO CARRIER message. Use the S86? command to read the value.

0 Normal disconnect; no error occurred.

3 Call Waiting caused disconnect.

4 Physical loss of carrier.

5 No error correction at the other end.

6 No response to feature negotiation.

7 This modem is async-only, the other sync-only.

8 No framing technique in common.

9 No protocol in common.

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