5.0 Hayes Emulation Mode

If the guard time is zero, timing is not a factor. The three escape characters can occur with any timing relationship, but they must be consecutive. Be cautious when assigning small guard times. You may not be able to enter three characters fast enough, especially if the guard time is less than the time required to transmit one character at the current transmission rate.

S18 — Diagnostic Timer. The value in register S18 determines how long a diagnostic test runs. For example, if S18 is set to 120, the test (activated by one of the &T commands) runs for 120 seconds. If S18 is set to zero (the default), the test timer is disabled and the test runs indefinitely. To terminate a test when the test timer is disabled, use the command &T0, or reset the modem. Register S18 is set to zero on powerup, or by the command AT Z or AT S18=0.

S25 — Delay To DTR. The effect of the value stored in register S25 is dependent on the operating mode, as explained below.

Synchronous mode 1 — Before the Modem examines the state of DTR, a delay occurs after a call is established. The duration of the delay is the value specified in S25 (in seconds). This allows the operator time to disconnect the Modem from an asynchronous data terminal and attach it to a synchronous terminal without forcing the Modem back into the command state.

Asynchronous mode and synchronous modes 1 and 3 — A change in DTR (ON or OFF) lasting for less than the value in register S25 (in hundredths of a second) is ignored by the Modem.

S26 — RTS To CTS Delay Interval. This register affects synchronous operation only. With the command &R0 in effect, CTS is turned on in response to an OFF-to-ON transition of RTS from the local DTE—after the delay specified by the value in register S26, but only if the Modem is on-line and ready to receive synchronous data.

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Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual Hayes Emulation Mode

MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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