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4-3SectionApplication Procedure
39
4-3 Connections
4-3-1 Types of Connection
Port connections for Host Link communications are shown in the following table.
Up to 32 nodes can be connected for 1:N connections.
Port Configura-
tion
Schematic diagram
RS-232C 1:1
5-V power
NT-AL001-E
RS-232C
Resistance ON
Resistance ON
RS-422A/485
RS-232C
NT-AL001-E
RS-232C
RS-232C 1:N
Resistance ON
NT-AL001-E
RS-232C
RS-232C
RS-422A/485
5-V power
Resistance ON
NT-AL001-E
RS-232C
RS-232C
RS-422A/485 1:1
Resistance ON
NT-AL001-E
RS-232C RS-422A/485
5-V power
Resistance ON
RS-422A/485 1:N
Resistance ON
NT-AL001-E
RS-232C
RS-422A
/485
5-V power
Resistance ON
3G2A9-AL001
RS-422A
/485
Note 1. Four-wire connections must be used for RS-422A/485 connections with
Host Link communications.
2. “Resistance ON” indicates the terminating resistance must be turned ON.
3. “5-V power” indicates that a 5-V power supply is required for the Link Adapt-
er. Refer to the Link Adapter manual for details. A 5-V power supply is not
required for a Link Adapter connected to a Serial Communications Board
because power is supplied from pin 6 of the connector.
4. The maximum cable length for RS-232C is 15 m.
Connection Examples
The connection examples in the remainder of this section show only the basic
connection diagrams. We recommend that appropriate noise countermeasures
be taken in actual applications, including the use of shielded twisted-pair cables.
Refer to 2-3 Wiring for actual wiring methods.