User guide

set switches
212 Chapter 2 Command Descriptions
pinout={standard|alternate}
Allows selection of four-wire pinouts for EIA-422/485 mode.
standard
Use standard 10-pin settings, as shown in the following table.
alternate
Use alternate 8-pin settings, as shown in the following table.
.
The default is "standard."
Examples Configure an endpoint on a multidrop network
The following command configures an endpoint on a EIA-485 multi-drop
network:
#> set switches ra=2 mode=485 txcontrol=auto wires=2 termination=on enable=on
Configure port settings for master and slave
On a four-wire multi-drop network, there are two scenarios of devices: the
master and the slave. A master gets a dedicated pair of wires to talk to the
slaves, so the transmitter can always be active. The slaves share a return
pair to the master and need to control their transmitters so that only one
device uses that pair at once. This example shows how to configure the
port settings for an EIA-485 four-wire scenario, both as a master and a
slave.
To configure port settings for a master, issue this command:
#> set switches range=<x> mode=485 txcontrol=alwayson wires=four
To configure port settings for a slave, issue this command:
#> set switches range=<x> mode=485 txcontrol=auto wires=four
Pin
Number
EIA-232
Signal
Standard 10-
Pin EIA-
422/485 Signal
(4/8 Wire)
Optional 8 pin
EIA-422/485
Signal (Alt-
4Wire)
EIA-485 Signal
(2-Wire Mode)
01 RI TXD- (B)
02 DSR RxD- (B) RxD- (B) Data- (B)
03 RTS RTS+ (A) TxD+ (A)
04 CGND CGND CGND CGND
05 /TxD TxD+ (A)
06 /RxD RxD+ (A) RxD+ (A) Data+ (A)
07 SGND SGND SGND SGND
08 CTS CTS+
09 DTR RTS- (B) TxD- (B)
10 DCD CTS- (B)