Multitech MMH900 User Manual page 68

F-11-F12 Inverted DTR
The Inverted DTR Commands (F11 and F12) work
in conjunction with Pacing Control and change the
way the MultiMux reacts tothe DTR signal. With
Xon/Xoff Flow Control and Pacing, you will end up
with Xon/Xoff Pacing, and with CTS Flow Control
plus Pacing, data flow will be controlled by the
presence of the DTR (pin 20) signal on the RS232
interface. F11 turns on Inverted DTR so that a high
signal stops data flow and a low starts data flow.
F12 turns off Inverted DTR so that it acts normal
(high on and low off). If Flow Control is off, Pacing
cannot be turned on. If Pacing is off, inverted DTR
cannot be turned on.
F13-F14 Xoff/First Char.
F13 is a special pacing command that is called X/off
First Character pacing. Selecting F13 causes the
MultiMux to stop data flow to the channel device
upon receipt of a Xoff Character. The next character
from the channel device will start data (it does not
have to be an Xon Character). F14 will turn off this
feature.
F15-F16 XPC
XPC is a special flow control that is used with the
Xon/Xoff flow control. This flow control command
changes the characters for stopping and starting
data to 65H and 67H. F15 enables XPC flow
control. F16 disables XPC flow control.
I0-1 Identification Commands
The Identification commands identify the type of
MultiMux. This information is valuable when
communicating with Multi-Tech's Technical Support
personnel about your unit or its performance. The l0
command identifies the product. The I1 command
indicates the unit's firmware type.
L-L0, L1-L8 List Channel Parameters
The List Channel Parameters command causes the
MultiMux to display the condition of the parameters
for each channel on the system's supervisory
Chapter 5 - Commands
68