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1-1SectionProtocol Overview
3
1-1-4 System Configuration
The following serial communications modes are supported by the Serial Com-
munications Board: Host Link (SYSMAC WAY), protocol macro, no-protocol, 1:1
Data Links, 1:N-mode NT Link, and 1:1-mode NT Link modes. The devices
shown in the following diagram can be connected.
Note The 1:1-mode NT Link and 1:N-mode NT Link communications modes use dif-
ferent protocols that are not compatible with each other.
General-purpose
external device
Programmable
Terminal (PT)
Programming
Device
(excluding
Programming
Console)
Host computer
Serial Communications Board
CQM1H-series CPU Unit
C-series PC
RS-232C
RS-422A/485
Protocol macros
No-protocol
NT Link
1:1
Data Link
Host Link Host Link
General-purpose
external device
Programmable
Terminal (PT)
Programming
Device
(excluding
Programming
Console)
Host computer
C-series PC
Protocol macros
No-protocol
NT Link
1:1
Data Link
Host Link
Host Link
Note An NT-AL001-E Converting Link Adapter can be used to convert between
RS-232C and RS-422A/485. This Link Adapter requires a 5-V power supply.
Power is provided by the RS-232C port on the Serial Communications Board
when the Link Adapter is connected to it, but must be provided separately when
connecting the Link Adapter to other devices.