Allen-Bradley 1746-BAS, User Manual, Page: 68 / 84

Publication 176-UM04A-US-P
A-2 Specifications
1747-PBASE BASIC
Development Software
Specifications The BASIC Development Software must be loaded into a personal computer to
operate. This personal computer must conform to the following specifications:
•
IBM PC/AT compatible computer with display and keyboard
•
DOS version 3.1 to 6.22
•
640K bytes of RAM memory
•
1 floppy disk drive (3 1/2 in. or 5 1/4 in.)
•
hard disk with 2M bytes free disk space
•
1 RS-232 compatible serial port
Refer to the BASIC Development Software Programming Manual (publication
number 1747-PM001A-US-P) for additional information.
Table A.4 Port Isolation
Port Isolation Isolation Voltage
PRT1 Backplane to Port 710V dc for 1 minute
PRT2 Backplane to Port 710V dc for 1 minute
PRT1 and PRT2 PRT1 to PRT2 710V dc for 1 minute
IMPORTANT
Port DH485 is not isolated.
Table A.5 Clock/Calendar Accuracy
Specification Range
Accuracy ± 1 minute/month @ 25 ° C
+ 0, - 6 minute/month @ 60
°
C
Table A.6 Maximum Communication Distances
Communication Maximum Distance Allowed m (ft)
Rate (bps) RS-232 RS-423 RS-422 RS-485
300 15 (50) 1230 (4000) 1230 (4000) 1230 (4000)
600 15 (50) 920 (3000) 1230 (4000) 1230 (4000)
1200 15 (50) 770 (2500) 1230 (4000) 1230 (4000)
4800 15 (50) 245 (800) 1230 (4000) 1230 (4000)
9600 15 (50) 120 (400) 1230 (4000) 1230 (4000)
19200 15 (50) 60 (200) 1230 (4000) 1230 (4000)
IMPORTANT
Use the RS-423 jumper settings when communicating in RS-232
mode.