User's Manual

ManualsBrandsOmron Corporation, RFID Business Development Department ManualsElectronicsRF ID Reader

4-6 Wiring Method

4-6

4-17

■ Example of wiring between host and Reader/Writer

Host side Reader/Writer side

Connector plug

(accessory)

Connected to

Name Pin number

１

２

３

４

５

■ Example of cabling between Reader/Writers

Reader/Writer side (COM1) Reader/Writer side (COM2)

Connector plug (accessory) Connector plug (accessory)

Name Pin number Name Pin number

1 RD RD 1

2 SD SD 2

3 SG SG 3

4 + + 4

5 - - 5

Note

●  Leave the pin for RS-232 unconnected.

●  Be sure to use a twisted-pair wire for the signal line.

●  Be sure to use a wire with a thickness of AWG20 for the signal line.

●  When you use a shielded cable, be sure to ground on the host side.

●  Make sure that the total cable length for 1-to-1 and 1-to-N connection is not longer than 300 m.

Note

When you connect more than one Reader/Writer, give special attention to communications timing

between Reader/Writers. To ensure proper timing, you will need to perform both theoretical calculation

of timing and verification of communications on real machines.

1) The Reader/Writers cannot operate simultaneously except through polling-related commands.

This means that, even when you connect more than one Reader/Writer, only one Reader/Writer

can communicate with the host at a time.

Multiple Reader/Writers can access the host only in a time-phased manner.

2) When you use an Auto command, the Reader/Writer will not return a response but continue to

wait if there are no Tags in the communications area. In this state, if you send a command to

another Reader/Writer, no command will be accepted until a response is returned. To avoid this,

you must abort the Auto command using the STOP command before sending any command.

3) Polling-related commands do not support any commands but Auto commands. These commands

are not available in Multiple Access Mode (which permits access to multiple Tags) to avoid

processing complexities.

Pin layout when cable connector on

Reader/Writer is viewed from engagingface  

Port

Terminal No.

Polarity.

COM1 COM2

5 5

* Short circuits have been established within RS-485

between Pin 4 of COM1 and Pin 4 of COM 2 and

between Pin 5 of COM2 and Pin 5 of COM1.