Multi-Tech Systems MTA128NT - Manual (Page 16)

Configuration Utilities
MTA128ST/NT 16
DTR Control _________________________________
A high DTR (Data Terminal Ready) signal on the RS232 serial port indicates your computer or terminal is
ready to communicate with your TA. It normally goes high when a communication program starts or is
ready to dial. Normal causes the TA to break the link and go into command mode when DTR drops. Ignore
causes the TA to ignore the DTR signal. Reset on DTR causes the TA to reset when DTR drops for the
time specified in register S25.
AT command: &D
CTS Control _________________________________
A high CTS (Clear to Send) signal on the RS232 serial port indicates the TA is ready to receive data.
Normally, it follows the state of the RTS signal. Select Normal to make CTS act normally. Select Always On
to force CTS high when the TA is offline. When the TA is online, CTS still provides flow control. Select
Momentary Drop to cause CTS to drop momentarily when the link is lost; then to go high again.
AT command: &R
DSR Control _________________________________
A high DSR (Data Set Ready) signal on the RS232 serial port indicates your TA is ready to communicate
with your computer or terminal. Normally, it follows the state of the DTR signal. Select Normal to make
DSR act normally. Select Always On to cause the TA to ignore the state of the DTR signal. Select
Momentary Drop to cause DSR to drop momentarily when the link is lost; then to go high again.
AT command: &S
DCD Control _________________________________
Normally, the DCD (Data Carrier Detect) signal on the RS232 serial port goes high when the TA receives a
connect message from a remote TA, and drops when the link is lost. Select Always On to satisfy a
requirement by some software packages for this state to be present constantly. Select Normal for normal
operation. Select Momentary Drop to cause DCD to drop momentarily when the link is lost; then to go high
again. The length of the drop is governed by register S10.
AT command: &C
Asynchronous/Synchronous Mode ______________
Normally, the MTA128ST/NT communicates in asynchronous mode. If you need transparent synchronous
communication, change this register setting.
AT command: &M