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1-2SectionBasic Operating Procedure
4
1-1-5 Mounting Location
The Serial Communications Board can be installed in Inner Board slot 1 of a
CQM1H-series CPU Unit. The Board cannot be installed in slot 2.
Serial Communications Board
Slot 2: Not mountable
Slot 1: Mount here
1-2 Protocol Overview
The following six serial communications modes can be used as required for
each serial communications port on the Serial Communications Board.
• Host Link:
For connections to host computers, personal computer peripheral devices, or
Programmable Terminals
• Protocol Macros:
For communications with general-purpose external devices using protocols
• No-protocol:
For connections to general-purpose devices for no-protocol communications
using TXD(––) and RXD(––) instructions
• 1:1 Data Links:
For 1:1 data links with a C-series PC, including another CQM1H
• 1:N-mode NT Link:
For communications with one or more Programmable Terminals (PTs)
• 1:1-mode NT Link:
For communications with one PT
Communications Ports and Serial Communications Modes
Board Port
Serial communications mode
Peripheral
bus or
Programming
Console bus
Host Link
(SYSMAC
WAY)
Protocol
macro
No-
protocol
1:1 Data
Link
1:N-mode
NT Link
1:1-mode
NT Link
Serial
Commu-
RS-232C
(port 1)
No OK OK OK OK OK (See
note 2)
OK (See
note 2)
nications
Boards
RS-422A/
485 (port 2)
No OK (See
note 1)
OK OK (See
note 1)
OK (See
note 1)
OK (See
note 2)
OK (See
note 2)
Note 1. A 4-wire connection must be used when using Host Link, no-protocol, or 1:1
Data Link communications with an RS-422A/485 connector.
2. The PT Programming Control functions are not supported.
Connection examples for the serial communications modes are shown in the fol-
lowing sections.