RDU Wiring, RX from the FIP goes to TX on ALL RDUs

F3200 Installation & Programming Manual		Document No: LT0122
Installation & Wiring

8.9	RDU WIRING

A FIP may drive up to 8 Remote Display Units (RDUs) that are programmed to send information back to the FIP. More "monitoring only" devices may be connected to the FIP RZDU Tx line. Some RDUs have their own power, but others require their power (24Vdc) to be supplied from the FIP or an approved PSU with battery backup.

The RDUs are all connected in parallel on common Tx and Rx circuits. Star and Bus wiring connections are permitted as shown in Fig 8.8.1.

NOTE: TX from the FIP goes to RX on ALL RDUs

RX from the FIP goes to TX on ALL RDUs

Fig 8.8.1 shows an example of interconnection between both MAF and Non-MAF configured RDU(s) and the FIP.

NOTES:	To maintain electrical isolation:
	(1)	Lk1 on the MAF/PSU Board should be cut for RDUs with their own
		MAF/PSU module.
	(2)	Non-MAF configured RDUs that are powered by a PSU other than the
		FIP must have Lk3 on the Remote Termination Board cut and Lk14 on
		the Controller in the “R” position.

Cable Limitations

The maximum distance to the furthest RDU is determined by the cable type used and the wiring arrangement.

(1)The MAXIMUM line resistance loop (FIP TX out, 0V return must not be greater than 150 Ω.

(2)The MAXIMUM inter-wire capacitance at the FIP RZDU terminals MUST NOT exceed 100 nF. This must be the total of all cables used - not just the length to the furthest RDU. Typically this is 1km of TPS cabling.

(3)The +V and 0V cables must be of sufficient size to avoid excessive voltage drops to RDUs when they are drawing maximum current (e.g. lamp test).

Page 8-24

5 July 2001

Issue 2.7

F3200 specifications

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Tyco F3200 manual RDU Wiring, RX from the FIP goes to TX on ALL RDUs, Cable Limitations

Models: F3200

RDU WIRING

RX from the FIP goes to TX on ALL RDUs

Cable Limitations

F3200 specifications