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Installation Guide APC Silcon 480kW 400V UPS 57
6.4 Remote Display
With the remote display unit data may be displayed at distances of up to 25 m from UPS. For
extended communication distance, see section below.
Remote display may easily be connected to UPS via one of the two serial communication ports
on the communication interface board.
To obtain a transmission distance of up to 3.2 km normal RS232C signal levels must be
converted to a long distance communication standard. The converter must be placed outside
the UPS cabinet.
6.4.1 Extension of Remote Display Communication Distance
Remote display communicates with the UPS through a 3-wire RS232 interface. Remote display
is a DTE (Data Terminal Equipment) employing a SUB-D 9-pin female connector.
Communication speed: 9600 bps.
For communication distances, see Table 1. Insert converters if longer distances are necessary,
or if communication cables are led through magnetically noisy areas. Converters must comply
with local regulations
Table 1: Remote Display Communication Extensions
Two converter boxes are required for a communication distance extension: One
box near the UPS for the conversion from RS232C to a long distance communication standard,
and another box at the other end to convert back to RS232C, which is to be connected to the
Remote Display. The converter provides optical signal insulation. Both converter boxes must
be supplied by an uninterruptible power source.
Standard
(RS232)
Short-haul
Modem Async
Max. distance 80/25 ft/m 10000/3200 ft/m
Converter Manufacture
Art. Code
No converter BLACK BOX
ME800A-R2
RS232 BLACK BOX connector Sub-D 25-pin female
BLACK BOX interconnector 4-screw terminal