Multi-Tech Systems ISIHP-4U, ISIHP-4SD manual Flow Control Commands, Bn Dummy command

Modem AT Commands & S-Registers

n = 0 Default: none

This command displays specific product information about your modem.

I0 or I returns the controller firmware version number. Use this command to identify your modem’s firmware level before calling Multi-Tech Technical Support. (Same as I3.)

&Bn Dummy command

&V View Current Configuration

Default: none

Use the &V command to display the active modem settings.

Flow Control Commands

Flow control refers to techniques used by data terminal equipment and the modem to pause and resume the flow of information between them. It prevents a device from accepting more data than it can handle. The modem implements flow control in both directions. When the modem halts the flow of data, it is called flow control. When the computer halts the flow, it is called pacing.

&Kn Local Flow Control Selection

n = 0, 3, or 4 Default: &K3

Allows you disable flow control and enable hardware or software flow control.

&K0 completely disables data flow control initiated by the modem. (Same as \Q0.)

&K3 enables modem’s use of Clear to Send (CTS) signal on the RS-232/ V.24 interface to regulate data flow. When CTS drops, data flow is suspended until the signal goes high (on) again. This method of flow control works in conjunction with pacing (i.e., computer-initiated flow control), which uses the Request to Send (RTS) signal on the RS-232/V.24 interface. Hardware flow control cannot be enabled unless an active error correction protocol is selected. This is the factory default setting. (This is the same as \Q3.)

90 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD