TransCore 0596465PT15 Manuel D’Utilisation

Installing the Encompass 4H Reader

4-23

Connect the red wire (CTS) from the yellow and red wire pair to pin 7 of the DB9
connector or pin 4 of the DB25 connector.

Note: When extending the RS-232 interface, use a three-pair cable such as Belden
2919. Use a twisted pair for the Black (RxD) with ground (Black of the Black and Yel-
low pair), and a twisted pair for Red (TxD) with ground (Black of the Black and Yel-
low pair). The third pair of the three-pair cable can be used for a spare in the event
either of the other two pair are damaged or fail. The cable shield should be tied to a
single-point Earth Ground on the controller end of the cable Refer to

Figure 4-14

Figure 4-14 RS-232 Cable Extension Diagram

–

422 Interface

–

422 interface signals are supplied by four wires from the Encompass 4H Reader

communications cable. Your host must have an RS

–

422 interface with either an inter-

nal or external converter.

Table 4-7

shows the RS

–

422 signals and their interface wires.

Table 4-7 RS

–

422 Interface Signal Wiring for Colored-Wire Pair Cable

Signal from Encompass 4H

Reader

Colored-Wire Pair Cable

Connect to

Signal from

Host

Wire Pair

from

Encompass

4H Reader

Color Used

–

422 Transmit positive

Yellow/Red

Yellow

Receive (+)

–

422 Transmit negative

Red

Receive (–)

–

422 Receive positive

Red/Black

Black

Transmit (+)

–

422 Receive negative

Red

Transmit (–)

Signal Ground

Yellow/Black

Yellow or
Black

Signal Ground