5. To connect to the next available port in the hunt group, invoke the /C (Connect) command
using the port name to specify the desired group of ports. For example, /C PRINTER
6. The CPM will connect to the first available port in the Hunt Group. If all ports in the
specified Hunt Group are presently connected, the CPM will respond with the "BUSY"
Note that it is only necessary to enter enough letters of the port name to differentiate the ports
in the Hunt Group from other ports. For example, to connect your resident port to the first
available port in a group of ports named "SALES1", "SALES2", "SALES3", and etc., the
connect command can be invoked as /C S, providing no other port names begin with the
The names of ports in Hunt Groups must be unique. Otherwise ports with names that are
similar or identical to the Hunt Group, will also be included in the Hunt Group.
Hunt Group Example 1:
1. Assume CPM Ports 1 and 2 have been configured in the Modem Mode, and modems have
been installed at both ports.
2. Assume Port 1 has been named "MODEM1" and Port 2 has been named "MODEM2".
3. If your resident port is Port 4, and you want to connect to the first available Modem,
access the CPM Command Mode, type /C MODEM and press [Enter].
Hunt Group Example 2:
1. Assume Ports 3, 4, and 5 have been configured in the Any-to-Any Mode and printers are
attached to each port.
2. All three ports have been named "PRINTER".
3. If your resident port is Port 1, and you want to connect Port 2 to the first available
printer, access the CPM Command Mode, type /C 02 PRINTER and press [Enter].
6.3. Port Buffers
When two ports are communicating at dissimilar baud rates, the Port Buffers prevent data
overflow at the slower of the two ports.
The Port Buffer provides 256K or 512K (optional) of non-volatile memory that is shared for
buffering purposes by all CPM ports. Buffer memory is dynamically allocated in blocks of 2K
characters. The Status Screen lists the amount of Buffer Memory currently used by each port.
Note that if data is allowed to accumulate in a port buffer, this will decrease the amount of
buffer memory available to other ports. If the Status Screen indicates an accumulation of data
at an unused port, the /E (Erase Buffer) command can be invoked to clear the buffer. To clear a
buffer, type /E nn [Enter], where nn is the number of the port buffer to be cleared.
CPM Series - Control Port Managers, User's Guide Operation