Omron CQM1H-SCB41 operation manual Application Procedure, Host Link Specifications

ConnectionsSection 4-2

4-1-2 Host Link Specifications

Item				Description
Communications mode	Half-duplex (Full-duplex for slave-initiated communications)
Synchronization	Start-stop (asynchronous mode)
Baud rate (see note 1)	RS-232C port and RS-422A/485 ports:
	1,200/2,400/4,800/9,600/19,200 bps
	Default setting: 9,600 bps
Communications	RS-232C port: 15 m max. (see note 2)
distance (see note 1)	RS-442A/485 port: 500 m max. (The total combined cable length is 500 m max. T-branch
	lines must be a maximum of 10 m long.)
Connection	RS-232C port: 1:1 (1:N (N = 32 Units max.) is possible using an Converting Link Adapters.)
configuration	RS-422A/485 port: 1:N (N = 32 Units max.)
Number of connected	32 Units max. (unit numbers 0 to 31; unit number 0 is set for 1:1 connection)
Units
Frame structure	C-mode Host Link commands
	Header:	@, address: (Host Link unit number) 0 to 31 (BCD)
	Data:	Header code + text
	Error check code: FCS
	Terminator:	*+CR
Error check codes	Vertical parity: Even, odd. or none
	FCS (horizontal parity converted to ASCII)
Command flow and	Command flow		Commands		Contents
support
	Host computer to		C-mode Host Link		1:1 or 1:N communications with directly connected
	PC		commands		PCs (The specified frame format must be prepared
					on the host computer and then sent.)
	PC to host		Data only		Communications using TXD(––) from CPU Unit.
	computer				No response from host.
					Connection between the host computer and PC
					must be 1:1.
Transmission delay	Host computer to PC				0 to 99,990 ms (set in PC Setup in 10-ms units)
time	The delay is from the return of a
	response by the PC until a response
	can be returned to the next command
	received from the host.
	PC to host computer
	The delay is from the beginning of
	TXD(––) execution until execution of
	the next TXD(––) can be started.
	Note 1. Confirm the baud rates and communications distance supported by con-
	nected devices.
	2. The maximum cable length for RS-232C is 15 m.

4-2 Application Procedure

1, 2, 3... 1. Turn OFF the power supply to the PC.

2.Mount the Board.

3.Connections

Connect the external devices using RS-232C or RS-422 cables. The TERM and WIRE switches on the front panel of the Board must be set if the Board is connected using the RS-4522A/485 port.

The host computer can be connected to a PC 1:1, or NT-AL001-E Convert- ing Link Adapters can be used to convert from RS-232C to RS-422A/485 to connect the host computer to PCs 1:N. Standard connection examples are

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