Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 137)

8O. Utility Programs II. SOFTWARE GUIDES - 8. Driver488/DRV
II-122 Personal488 User’s Manual, Rev. 3.0
Printer Port Assignments Serial Port Assignments
LPT1: LPT2: LPT3: LPT4: COM1: COM2: COM3: COM4:
LPT1 LPT2 (none) (none) COM1 (none) (none) (none)
The IEEELPT command takes up to four optional device arguments. Each argument is of the form
IEEEpp , IEEEppss or LPTn , where pp is an IEEE 488 bus primary address from 00 to 30 , ppss is a
bus address composed of a primary address from 00 to 30 followed by a secondary address from 00 to
31 , and n is a physical printer port device number, from 1 to 4 .
If IEEELPT is executed with no arguments, then it just displays the current logical printer port
assignments. If one or more arguments are provided, then the first logical printer port ( LPT1: ) is
redirected to the physical device specified by the first argument, the next logical port ( LPT2: ) is
redirected to the next specified physical device, and so on. If fewer than four devices are specified,
then the remaining logical printers are directed to any unused physical parallel printer ports. For
example, on a machine with two physical parallel printer ports these commands have the effects
indicated in the following table:
Command Printer Port Assignments
LPT1: LPT2: LPT3: LPT4:
(Boot-Up) LPT1 LPT2 (none) (none)
IEEELPT (No change) LPT1 LPT2 (none) (none)
IEEELPT IEEE05 IEEE05 LPT1 LPT2 (none)
IEEELPT IEEE05 IEEE1201 IEEE05 IEEE1201 LPT1 LPT2
IEEELPT IEEE05 IEEE1201 IEEE17 IEEE05 IEEE1201 IEEE17 LPT1
IEEELPT IEEE05 IEEE1201 IEEE17 IEEE29 IEEE05 IEEE1201 IEEE17 IEEE29
IEEELPT LPT1 IEEE05 LPT1 IEEE05 LPT2 (none)
IEEELPT LPT2 LPT1 IEEE1201 LPT2 LPT1 IEEE1201 (none)
Note that the port assignments are flexible, any order may be used. Also note how the physical printer
ports are added to the assignments if there is room for them and if they have not already been specified.
Serial port redirection is accomplished by IEEECOM . IEEECOM is used identically to IEEELPT except
that the physical port names (without colons) are COM1 through COM4 rather than LPT1 through LPT4 .
For example, the IEEECOM command:
IEEECOM IEEE12 COM2 COM1
will redirect communications from COM1: to IEEE 488 bus device 12 , COM2: to COM2 , and COM3: to
COM1 .
In addition to the port specifications, both IEEELPT and IEEECOM allow two optional parameters. The
/Aioaddr parameter is used to specify the I/O base address of the IEEE 488 interface board and the
/Baddr parameter sets its IEEE 488 bus address.
The I/O base address must be specified when the associated IEEE 488 interface board is not at the
default I/O address of
02E1 (hex) . The I/O base address is usually given as a hexadecimal number.
For example, to use the default I/O address, the parameter would be /A&H02E1 . If the hexadecimal I/O
address ends in a 0 or an 8 then consecutive I/O addresses will be used. If the address ends in a 1 then
I/O addresses will be separated by &H400 . I/O addresses ending in other than 0 , 1 , or 8 are not
allowed. For example, the command:
IEEELPT IEEE05 /A&H22E1
would configure LPT1: for output to IEEE 488 bus address 05 on a second interface card located at
22E1 (hex) . The I/O base address is usually set by switches or jumpers on the interface card. Refer
to the manufacturer’s instructions for your IEEE 488 board to determine its I/O address. The default
I/O port base address for
IEEELPT and IEEECOM is /A&H02E1 .