18 Chapter 2: TempScan/1100 & MultiScan/1200 TempScan / MultiScan User's Manual
The rear panel DIP switch is read only during power-on or reset and should be set before applying
power. To modify any of these defaults, change the microswitch settings using a small screwdriver.
The enclosure does not need to be opened to change these settings.
IEEE 488 Configuration
One way in which the TempScan/1100 or MultiScan/1200 unit can be controlled, is through its
IEEE 488 port connector. Consequently, when configured as an IEEE 488 bus device, the unit must
have an IEEE 488 bus address.
DIP Switch
For IEEE 488 operation, the single microswitch labeled COMM SELECT should be down (0) on the
rear panel DIP switch . This down (0) position is the factory default. The up (1) position is reserved
for RS-232/RS-422 serial communication. When IEEE 488 operation is enabled, the five
microswitches labeled IEEE ADDRESS are used to configure the required IEEE 488 bus address.
The bus address can be set from 0 through 30 and is read only at power-on or reset. The address is
selected by simple binary weighting. The switch labeled 1 is the least significant bit (LSB); 16 is the
most significant bit (MSB). The factory default is bus address 7. Note that if address 31 is selected, it
defaults to address 30 because the IEEE 488 standard has reserved address 31.
The rear panel DIP switch is read only during power-on or reset and should be set before applying
power. To modify any of these defaults, change the microswitch settings using a small screwdriver.
The enclosure does not need to be opened to change these settings.
RS-232/RS-422 Serial Configuration
Alternatively, the TempScan/1100 or MultiScan/1200 unit can be controlled through its serial port
connector. Complete serial port configuration is accomplished by using both internal jumpers and DIP
switch settings. The internal jumpers, located on the main board behind each serial connector, are used
to configure the port with either RS-232 or RS-422 electrical characteristics. The DIP switch, located
on the rear panel, is used to determine handshaking, parity, and baud rate. Furthermore, the selection
of an RS-232 or RS-422 electrical configuration determines the serial port pattern of pin connector
signals, as discussed later.
Internal Jumpers
The jumpers within the unit configure the serial port electrically as either RS-232 or RS-422. To
change the serial port configuration, it is necessary to perform the following steps:
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