The MHUBX8, 8-Port RS485 REPEATER/HUB with RS232 PORT:

General Description:

The MHUBX8 is an 8-port automatic RS485 hub repeater (non-isolated) with a master RS232/RS485 port. The unit can be used to expand RS485 serial communications networks by increasing the maximum distance and/or number of nodes. Data received by the master port is transmitted to all eight distribution ports (CHA thru CHH). Data received into a distribution port is transmitted out the master port, but is NOT transmitted out any other distribution port. Each distribution port has its own termination jumper and an RXEN (receive enable) jumper. Bias is fixed with 620 Ohms of pull-up and pull-down resistance to hold the data lines in a known state when the data lines are inactive. Each distribution port on the MHUBX8 hub will support up to 32 full-load RS485 devices. Additional units/nodes can be added, using 1/2(64 units) and 1/4(128 units) load devices. The SN75LBC184 transceiver IC, employed in the MHUBX8, is a 1/4 load device, has built-in transient protection and is slew rate limited to 250 Kbps.

 

Download:
	MHUBX8manual.pdf	Multi-repeater manual
	MHUBX8.pdf	Multi-repeater schematic
	MHUBX8ss.pdf	Multi-repeater physical drawing

	"Let me spin a very large RS485 network for you!"