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INDUSTRIAL MODEM RF115
8. Call Book Selections
(2) Edit Call Book
The Call Book allows the user to determine with which other modems a given
modem will communicate, based on the serial numbers for both the master and
slave. The modem’s serial number is encoded in the microprocessor and identified
on the bottom label of the unit. The instructions provided in this section are for
point-to-point mode only. Use of the Call Book for multipoint systems is explained
later in this chapter.
For two modems to communicate in point-to-point mode, three events must occur:
1. The serial number for the master must be listed in the slave’s Call Book.
2. The serial number for the slave must be listed in the master’s Call Book.
3. The master must be programmed to call the slave.
As shown in Figure 8-1, the Call Book allows you to set up a list of up to 10 modems
with which the modem can communicate, designate up to 2 repeaters to be used in
communicating with a given modem, and tell the master which slave to call. To
direct the master to call a slave, the user must be in the Call Book Menu. A specific
slave may be called by entering C at the prompt, followed by the menu number
corresponding to that slave. To call any available slave in the list, enter C and then
A
(for All).
NOTE
To call a slave through one or two repeaters, you must call that slave
directly (as opposed to using the Call All option). When Call All is
selected, the master is not able to connect with any slaves through
repeaters. This is because the master calls every slave in the list when
instructed to call all and will connect with the first slave to respond.
When calling through a repeater, the master must first call that repeater
and establish a communications link with it before making contact with
the slave.
Summary of Contents for MD3310-R2
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