ClearOne comm AP400 operation manual Installation ~ LCD Programming RS-232

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Figure 2.13 . RS-232 parameters

LCD submenu

Installation ~ LCD Programming

RS-232

Five RS-232 parameters can be adjusted through the menu (see Figure 2.13). These parameters are baud rate, flow control, modem mode, and clear password.

If data is lost during serial access through the RS-232 port, a serial overrun error will occur. This is indicated by flashing microphone LEDs. If the error is caused by incoming data, Meter LED “+12” flashes red; Meter LED “-10” and “Mic 4” flash green. If the error is caused by outgoing data, Meter LED “+12” flashes red; Meter LED “-10” and “Mic 3” flash green. Call our Technical Services Group for help correcting this error.

Baud rate

This parameter sets the AP400’s RS-232 port communication rate at either 9,600 (default), 19,200, or 38,400 baud (bps). To set the baud rate, scroll through the three settings to select the desired baud rate, then press Enter.

Flow Control

This parameter allows activation and deactivation of hardware flow control. The two options are On and Off (default). To activate the flow control, scroll to on and press Enter. To deactivate it, scroll to off and press Enter.

✍ Disabling the timeout will allow the AP400 to remain in the same position in the

LCD menu until the LCD menu is manipulated again.

Modem mode

This parameter controls whether the AP400 is set to communicate by a modem through its RS-232 port. Upon activating modem mode or when power is turned on while modem mode is active, the AP400 sends an init string to the modem to initialize it. (The init string can only be set through the RS-232 port. See Appendix E, page 56 for information on the the MINIT serial command.) The default setting is off. To activate modem mode, scroll to the on setting and press Enter. To deactivate modem mode again, scroll to off and press Enter.

Clear password

This parameter clears the RS-232 password for modem access. This password is set with the RS-232 command MPASS (see Appendix E, page 57). The Clear Password function is helpful if the password is forgotten and needs to be reset. However, the password cannot be set through the front-panel LCD. It can be set through the RS- 232 port. This password is not to be confused with the front panel passcode, which performs a completely different security function.

Timeout

The AP400 has a system mode called Timeout. This parameter can be adjusted through the RS-232 port using the TOUT command (see Appendix E, page 65). Timeout controls the delay time (in minutes) before the LCD panel will automatically switch back to the title screen and default meter. The range is zero to 15 minutes. Default is 10 minutes; zero disables this mode.

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