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RS-485 Configuration 21

SCO OpenServer

RS-485 Configuration

If you have installed a RocketPort that supports RS-485 and have

configured one or more ports for RS-485 operation (see the Hardware

Reference Card), there are two ways to configure RS-485 service.

• rs485

This program enables you to remap a port to enable or disable

RS-485, for the current session only.

• rs485.init

This enables you to remap a port to enable or disable RS-485

automatically each time the system is rebooted.

RS485

Follow these steps to temporarily enable or disable RS-485:

1. Disable the port you want to work with.

2. To enable RS-485 on a port, enter this command:

/comtrol/rckt/rs485 -y /dev/<portname>

To disable RS-485 on a port, enter this command:

/comtrol/rckt/rs485 -n /dev/<portname>

3. Repeat these steps for each port you want to enable or disable.

Note: Do not enable RS-485 for a port configured for RS-232.

RS485.init

Follow these steps to permanently enable or disable RS-485:

1. Edit the /comtrol/rckt/rs485.cfg file to add or delete the ports you are

remapping. To enable a port, add it to the list. To disable a port,

remove it from rs485.cfg or comment it out. For example:

/dev/ttyr0a

/dev/ttyr0b

indicates that port 0 and port 1 on Board 1 are enabled for RS-485.

#/dev/ttyr0a

#/dev/ttyr0b

indicates that port 0 and port 1 on Board 1 are disabled for RS-485.

(The # indicates a commented-out line.)

2. Reboot the system, or execute /comtrol/rckt/rs485.init for immediate

change. The ports are remapped according to the contents of the

/comtrol/rckt/rs485.cfg file each time the system is rebooted.

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Comtrol SCO OpenServer Manual de usuario Pagina 21