System information

Crestron 2-Series Control Systems Reference Guide
Reference Guide – DOC. 6256A 2-Series Control Systems • 85
The pin assignments for the DB25 female-to-DB25 male straight-through cable are
listed in the following table:
Pin Assignments for DB25 Female-to-DB25 Male Straight-Through Cable
DB25 FEMALE DB25 MALE
PIN NAME PIN NAME
2 TX 3 RX
3 RX 2 TX
4 RTS 5 CTS
5 CTS 4 RTS
6 DSR 20 DTR
7 GND 7 GND
8 CD 20 DTR
20 DTR 6 DSR
20 DTR 8 CD
22 RI - N/A
- N/A 22 RI
The pin assignments for the DB9 male-to-DB25 male gender changer cable are listed
in the following table:
Pin Assignments for DB9 Male-to-DB25 Male Gender Changer Cable
DB9 MALE DB25 MALE
PIN NAME PIN NAME
1 CD 8 CD
2 RX 3 RX
3 TX 2 TX
4 DTR 20 DTR
5 GND 7 GND
6 DSR 6 DSR
7 RTS 4 RTS
8 CTS 5 CTS
9 RI 22 RI
Cable Requirements (PC to Modem)
The modem on the PC can be either internal or external. There are no special
requirements or cabling required (i.e. it can be either USB or serial). Follow the
guidelines in the modem manufacturer's handbook to determine any cable
requirements.
Modem Configuration (Control System Modem)
In order to support out-of-the box communications with a modem, the modem must
have DIP switches to activate and/or deactivate certain functions. The DIP switch
settings are described in “Quick Guide” on page 82. Any compatible modem can be
used as long as it has the same settings.
Crestron does support modems without DIP switches (software-configurable).
However, the modem may support commands that mimic the DIP switch settings
described in “Quick Guide” on page 82. This type of modem must first be configured
first plugging it into a PC, and as such, is not “out of the box” compatible.
The control system must have operating system version 3.129 or later to support out-
of-the-box modem communications. When the control system is rebooted (i.e.
powered up, HW-R pressed and released, REBOOT command issued at console),