Filter
Top Products
Installation ~ LCD Programming
22
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
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.
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.
Disabling the timeout will
allow the AP400 to remain
in the same position in the
LCD menu until the LCD menu is
manipulated again.
Figure 2.13 . RS-232 parameters
LCD submenu
✍