1250 Frequency Response Analyzer The 1251 Multichannel Analyzer System
AMK/1250/1 16-5
16.5 1251 UNIT IDENTIFICATION SWITCHES
There is a set of four switches (numbered 1 to 4) on the rear panel of each 1251 Unit,
labelled Unit Identification, as shown in Fig. 16.2. Each 1251 Unit must have one of
the four switches, and one only, in the ON (up) position. The number of the switch
selected becomes the Unit number; this number must be different for each 1251 Unit,
to enable the 1250 to distinguish between Units in the 1250-1251 Interface Bus and
route data correctly to and from them.
The number chosen for each Unit need not be related to its position in the 1250-1251
Interface Bus, nor to the number of Units connected. So, for example, the sole 1251
Unit in an incomplete Multichannel Analyzer System could be set at Unit number 4 if
wished, even though Units 1, 2, and 3 are absent.
16.5.1 ANALYZER CHANNEL NUMBERING
Individual channels within each 1251 Unit are allocated numbers 1, 2, 3, 4, 5, 6, 7, and
8, by factory settings. If less than eight channels are fitted in a 1251 Unit, the channel
numbering is sequential and starts at 1. When extra channels are required to be fitted,
1251 Units should be returned to Solartron.
The 'system number' of a channel has two digits: the first digit is the appropriate 1251
Unit number (1 to 4) and the second digit is the channel number within that Unit (1 to 8).
So, for example, channel number 7 in the 1251 Unit with Identification Switch set to
number 2 has the system number:
ANALYZER (27)
16.6 MANUAL OPERATION OF THE SYSTEM
16.6.1 INTRODUCTION
The 1251 Multichannel Analyzer System may be set up manually via the front panel
keys of the host 1250 as described below.
Alternatively, the system operation may be commanded through a remote Controller
connected to the IEEE 488 or RS 423 interface port of the 1250, as described in Section
16.7.
To operate the 1251 System manually the Analyzer and Display/Plotter menus must be
set up specifically for multichannel use, in addition to the setting up of the 1250 for
conventional two-channel use.
16.6.2 MANUAL SETTING UP OF THE 1251 SYSTEM
Any menus already set up in the host 1250 are not affected by connecting it into the
multichannel configuration.
Assuming that the system has been connected up and all Identification Switches set
proceed as follows:
1. Switch on all Units in the system, wait for at least one second, then press the BREAK
key. Alternatively, press the Self Test key followed by any one of: CHECK, TEST,
INIT, or RESET, if appropriate. This ensures that the 1250 has identified each 1251
Unit present in the system.
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