User Manual

86 Chapter 18 Specifications

Device Server EIA 232/422/485 Switch Settings

DB9 Pinouts

WARNING: To prevent electric shock, do not remove the cover of this

module while unit is powered up. There are no user-serviceable parts

inside. Refer servicing to qualified personnel.

CAUTION: This unit has two power inputs. For total isolation from electrical

shock and energy hazard, disconnect both power inputs. The device is

intended to be mounted in an indoor only type system.

Function

Switch Settings

1 2 3 4

EIA-232 Up Down Down Down

EIA-422/485 Full-duplex Down Up Down If up, termination.

If down,

no termination

EIA-485 half-duplex Down Down Up

DB9

EIA-232

EIA-422/485

Full-Duplex

EIA-485 Half-

Duplex

1 DCD CTS- Not used

2 RxD RxD+ RxD+

3 TxD TxD+ TxD+

4DTR RTS- Not used

5GND GND GND

6 DSR RxD- RxD-

7RTS RTS+ Not used

8 CTS CTS+ Not used

9 NA TxD- TxD-