Omron CQM1H-SCB41 1-2 Protocol Overview

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.