Omron CQM1H-SCB41 operation manual NT Link Settings for 1N Mode, NT Link Settings for 11 Mode

Connections Section 8-2

6.With some PTs, timeout settings can be changed to eliminate some of the communications errors. Refer to the operation manual for the PT for details. This is true in both 1:1 and 1:N mode.

7.If more PTs are required by the system than allowed by the above restric- tions in 1:N mode, connect the PTs in smaller groups to different ports.

8-2 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-422A/485 port.

The CPU Unit can be connected to a Programming Console, the CX-Pro- grammer, or the CX-Protocol as required.

4.Turn ON power.

5.Set the PC Setup settings for the Serial Communications Board.

Use a Programming Console, the CX-Programmer, or the CX-Protocol to set the settings in the PC Setup between DM 6550 and DM 6559.

Note The settings stored in these words are read constantly; the PC does not need to be restarted or reset when changes are made to the set- tings. They will be updated automatically as soon as they are changed.

NT Link Settings for 1:N Mode

The following table shows the settings for connecting more than one PT when the highest PT unit number is 5.

Port 1	Port 2	Bit(s)	Setting	Function
DM 6555	DM 6550	00 to 07	---	Not used.
		08 to 11	5 (BCD)	Maximum Programmable
				Terminal unit number
				1 to 7 (BCD)
				NT Link in 1:N mode
		12 to 15	5 Hex	Communications mode
				NT Link in 1:N mode
DM 6556	DM 6551	00 to 15	---	Not used.
DM 6557	DM 6552	00 to 15
DM 6558	DM 6553	00 to 15
DM 6559	DM 6554	00 to 15

Port Settings are always the same for 1:N-mode NT Links. Settings of the start bits, stop bits, parity, and baud rate are not necessary and will be ig- nored.

Set the communications mode to a 1:N-mode NT Link (5 Hex).

Up to 8 PTs can be connected in 1:N mode. Set the highest unit number of the PTs to be connected as the maximum Programmable Terminal unit num- ber.

NT Link Settings for 1:1 Mode

The following table shows the settings for a 1:1-mode NT Link.

Port 1	Port 2	Bit(s)	Setting	Function
DM 6555	DM 6550	00 to 11	---	Not used.
		12 to 15	4 Hex	Communications mode
				NT Link in 1:1 mode

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