Communication bus and supply power table - Metasys - MS-VMA1615 - MS-VMA1626 - MS-VMA 1628 - MS-VMA1630 - Field Device

Table 1. Communication bus and supply power terminal blocks, functions, ratings, requirements, and cables
Terminal block/Port label	Terminal labels	Function, electrical ratings/Requirements	Recommended cable type ¹
FC BUS ²	+ -	FC Bus Communications	0.6 mm (22 AWG) stranded, 3-wire twisted, shielded cable recommended
	COM	Signal Reference (Common) for bus communications
	SHLD	Isolated terminal (optional shield drain connection)
SA BUS ²	+ -	SA Bus Communications	0.6 mm (22 AWG) stranded, 4-wire (2 twisted-pairs), shielded cable recommended Note: The + and - wires are one twisted pair, and the COM and SA PWR wires are the second twisted pair.
	COM	SA Bus Signal Reference and 15 VDC Common
	SA PWR	15 VDC Supply Power for Devices on the SA Bus
FC BUS	FC BUS	RJ-12 6-Position Modular Port provides FC Bus Communications FC Bus provides 15 VDC Power for: Wireless Bluetooth Commissioning Converter Wireless ZigBee Field Bus Router
SA BUS ²	SA BUS	RJ-12 6-Position Modular Port provides SA Bus Communications SA Bus provides 15 VDC Power for: NS Series Sensors Wireless ZigBee WRZ-78xx Series One-to-One Wireless Receiver Wireless Bluetooth Commissioning Converter (BTCVT) DIS1710 Local Controller Display VAV Balancing Tool	24 AWG 3-pair CAT 3 Cable <30.5m (100 ft)
24~	HOT	24 VAC Power Supply - Hot Supplies 20–30 VAC (Nominal 24VAC)	0.8 mm to 1.0 mm (20 to 18 AWG) 2-wire
24~	COM	24 VAC Power Supply Common The -0 models isolate this terminal from all other commons. The -1 models only isolate this terminal from the FC bus common.	0.8 mm to 1.0 mm (20 to 18 AWG) 2-wire

¹ See Table 2 to determine wire size and cable lengths for cables other than the recommended cables.

² The SA Bus and FC Bus wiring recommendations in this table are for MS/TP Bus communications at 38.4k baud. For more information, refer to the Metasys IP Networks for BACnet/IP Controllers Configuration Guide (LIT-12012458). and MS/TP Communications Bus Technical Bulletin (LIT-12011034).

Communication bus and supply power table - Metasys - MS-VMA1615 - MS-VMA1626 - MS-VMA 1628 - MS-VMA1630 - Field Device - VMA16 VAV Modular Assembly

VMA1615/1626/1628/1630 VAV Controllers Installation Guide