Name: Contec SBC Series
Brand: Contec
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4. Jumper Settings

PC-686BX(NLX)-LV, PC-686BX(NLX)-LVV

RS-232C/422/485 Selector Switch: JP1/JP2

Table 4.2. JP1/JP2: RS-232C/422/485 Selector Switch

RS-232C

(Default)

RS-422

RS-485

1. For RS-485, the TX+ (pin 2) and RX+ (pin 3) lines must be

jumpered together in the D-type connector.

2. The same applies to the TX- (pin 1) and RX- (pin 4) lines.

JP2 JP1

2 4 6 8 10 2 4 6 8 10 12 14 16 18 20 22 24

1 3 5 7 9 1 3 5 7 9 11 13 15 17 19 21 23

JP2 JP1

2 4 6 8 10 2 4 6 8 10 12 14 16 18 20 22 24

1 3 5 7 9 1 3 5 7 9 11 13 15 17 19 21 23

JP2 JP1

2 4 6 8 10 2 4 6 8 10 12 14 16 18 20 22 24

1 3 5 7 9 1 3 5 7 9 11 13 15 17 19 21 23

Transmit Data Control for Half-Duplex Mode

The transmit buffer must be controlled to prevent transmit data collisions in half-

duplex mode. The port controls data transmission using the RTS signal and bit 1 of

the modem control register.

Modem Control Register

(I/O address + 4H) Bit 1: 0 ... RTS high (Transmit disabled)

1 ... RTS low (Transmit enabled)

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Contec SBC Series Specifications

General