System information

Reference Guide Crestron 2-Series Control System
86 • 2-Series Control Systems Reference Guide – DOC. 6256A
the control system will output the AT command, followed by a carriage
return/linefeed (\x0D\x0A). It will then wait three seconds, and then continue with
the normal bootup sequence. The AT command will only be seen on the serial
console. It will not be seen on any other system console.
Once the modem is connected to the control system and powered on, it is necessary
to reboot the control system (i.e. cycling power, HW-R pressed and released, or
REBOOT command issued at console) in order for the AT command to be sent out.
When the control system sends the AT command to the modem, the modem will
synchronize its serial port baud rate to the serial port baud rate of the COMPUTER
port of the 2-Series control system.
Modem Communications Speed
The final connection speed modem connection is only as fast as the slowest link.
There are three links in a modem connection:
• PC to modem.
• Modem to modem.
• Modem to 2-Series control system.
PC to Modem
The PC modem is required to support communications through a COM port.
Although it has not been tested by Crestron, a USB modem that provides Microsoft
Windows
®
driver-level support for treating the modem as if it were on a COM port
should also work. A COM interface is required, since communications to the control
system for uploading programs, etc. is done through the viewport, which only works
through a COM port.
It is recommended to set the Viewport (press ALT+D) to 115200 baud, no parity, 8
data bits, 1 stop bit, and RTS/CTS: ON for communications.
Modem to Modem
The speed between modems can vary greatly depending on the quality of the phone
lines and other factors that are dependent on the telephone system.
Modem to Control System
It is recommended to leave the serial port baud rate of the 2-Series control system at
115200 baud, no parity, 8 data 1its, 1 stop bit, and RTS/CTS: ON to achieve
maximum throughput.
Handshaking is enabled on both serial connections (PC to modem and modem to
2-Series control system). Therefore, no matter how fast the link, proper hardware
handshaking ensures that there will be no overrun conditions.
Notes for QM-RMC and QM-RMCRX(-BA)
The QM-RMC and QM-RMCRX(-BA) do not have dedicated console ports. The
COM B port is used as both a console port and a program addressable COM port.
When either system is first powered up out of the box, COM B will operate in the
console mode. If there is no program loaded on to the system, COM B will operate
in the console mode. When a program is loaded and the control system reboots (i.e.