Electro-Voice 250, 1252 operation manual Irig-B

RS-232 Extension

Cable

(1 to 1 wiring)

I/O Modules and Display require power connections to the +/- voltage terminals (dashed lines).

For all communications: S=Shield. This connection is used to reference the Nexus port to the same potential as the source. It is not an earth-ground connection. You must also connect the shield to earth-ground at one point.

RS-485 Master	Nexus P40N External Display		Nexus I/O Module
Unicom or Modem Manager
– – + + G
		A(+) B(-) S - V +		A(+) B(-) S - V +

RT=

~120 Ohms

RT=

~120 Ohms

RT=

~120 Ohms

			+ V - S B(-) A(+)		+ V - S B(-) A(+)	+ V - S B(-) A(+)
			Port 1				Port 3
					Port 2
		RS-232 or			Normally Slave
		RS-485 (Set)		Modem/Ethernet Gateway
RS-232	RS-485

RT=

~120 Ohms

RT=	RT=
~120 Ohms	~120 Ohms

+ V - S B(-) A(+)	8 7 6 5 4 3 2 1 C	- +
Port 4
	High Speed Inputs	IRIG-B

NOTE: You may use ANY port to connect a Nexus Display or RS-485 Master. However, if you are using the Internal Modem (or Network) Option, Port 2 is labeled Modem (Ethernet) Gateway. Ports 1, 3 and 4 DO NOT change. The I/O Modules MUST use Port 4 (Port 3 is an alternate).

Nexus P40N, P41N or P43N Display is shipped programmed to use Port 3—see section 5.7 for details.

Figure 5.4: Communication Wiring

e Electro Industries/GaugeTech Doc # E107706 V1.25 5-4