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4-6 Wiring Method
■ Example of wiring between host and Reader/Writer
Host side
Connected to
+
-
■ Example of cabling between Reader/Writers
Reader/Writer side (COM1)
Connector plug (accessory)
Name
1
2
3
4
5
● 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.
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.
Reader/Writer side
Connector plug
(accessory)
Name
Pin number
RD
SD
SG
+
-
Pin number
RD
SD
SG
+
-
Pin layout when cable connector on
Reader/Writer is viewed from engagingface
１
２
３
４
Terminal No.
５
Polarity.
* 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.
Note
Note
2
1
3
4
5
Port
COM1
4
5
-
+
Reader/Writer side (COM2)
Connector plug (accessory)
Name
RD
SD
SG
+
-
4-6
COM2
4
5
-
+
Pin number
1
2
3
4
5
4-17
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