Indicators and Switches
Figure C-3 shows the front panel of the CP01, which includes five indicators and
two switches. The switches allow each of the RS232-C ports (PRIMARY and
SECONDARY) to be separately selected for DCE or DTE configuration.
The front-panel indicators function as follows:
•
POWER ON:
Glows red when the CP01 is receiving power.
•
PRI:
Glows red when the primary RS232-C port is receiving data.
•
SEC:
Glows red when the secondary RS232-C port is receiving data.
•
RS485:
Glows red when the RS485 port is receiving data.
•
COLL:
Glows red when a transmission collision occurs—i.e., when
two ports are receiving data at the same time. Data usually will be
corrupted when COLL glows red.
Figure C-1. CP01 Application with Single RS485 Chain
Network
Management
System
CP01
Access-T
Access-T
. . .
RS-232
RS485
Up to 30 chained units
Appendix C
ACST-0351-005
CP01 Chain Port Expander
June 1996
C-2