APC 990-4053 manual Extension of Remote Display Communication Distance

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6.4Remote 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

	Standard	Short-haul
	(RS232)	Modem Async
Max. distance	80/25 ft/m	10000/3200 ft/m
Converter Manufacture	No converter	BLACK BOX
Art. Code		ME800A-R2
RS232 BLACK BOX connector		Sub-D 25-pin female
BLACK BOX interconnector		4-screw terminal

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.

990-4053

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