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4.4. Connecting Devices to the CPM
From modems to printers, many different types of devices can be connected to the CPM. To
physically connect a device to the CPM, proceed as follows.
1. Access the Command Mode.
2. Determine which CPM port will be used for connection to the new device (e.g. Port 3).
3. Type /S and press [Enter]. The CPM will display the Status Screen. Find the "BUFF"
column in the Status Screen. The BUFF column lists the amount of memory currently
being used to store buffered data for each port.
a) If the Status Screen indicates the port has data stored in buffered memory, issue the /E
command to clear the buffer. The /E command uses the following format:
/E nn [Enter]
Where nn is the number of the CPM port buffer to be cleared. For example, to clear
the buffer for port three, type /E 3 and press [Enter].
b) Note that buffered data which has been cleared using the /E command cannot be
recovered.
4. Attach an appropriate Snap Adapter to an RS-232 serial port on the device you intend to
connect. Refer to Appendix A for more information on WTI Snap Adapters.
a) Modem: Ports 1 and 2 can be configured for the Modem Mode, which provides
Password restricted access to the Command Mode, and allows the user to re-define
the Modem Reset and Hang-Up Messages. An external modem can also be connected
to any other CPM port, providing the modem does not require password protection, or
an externally generated reset or hang up message. Connect an SA-25M Snap Adapter
to the modem's serial port.
b) PC: Any CPM RS-232 Port can be used for connection to a PC. For 25 pin PC COM
ports, use an SA-12F Snap Adapter. For 9 pin PC COM ports, use an SA-9F Snap
Adapter.
c) Printer: Any CPM RS-232 Port can be used for connection to a printer. Use an SA-
12M Snap Adapter.
d) Other Devices: For a description of the CPM Port interface, please refer to
Appendix A.
5. Connect a 6 wire, straight wired RJ11 cable from the Snap Adapter to a vacant CPM RS-
232 port.
6. Select communication parameters for the port as described in Section 5.3.4.
4-4
CPM Series - Control Port Managers, User's Guide Hardware Installation
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