User guide

PN 161-09981-007A

January 2010

Wireless I/O Extender User’s Guide

(B) MODBus RTU for the SRM radio

(7) MODBus RTU for the PLR radio

0 to disable MODBus RTU mode (Default)

1 - 9 to use MODBus RTU mode, the larger the number the longer the delay for collection full packets.

Note: When using the SRM6000’s in ModBus RTU mode the Master Packet Repeat must be set to “3” regardless

of whether the modems are being used in point-to-point or multi-point mode. If a setting that is higher than “3” is

required, it can be done, but the throughput speed will be decreased. (A higher Master Packet Repeat setting may

need to be used when the radios are in a high noise environment or at long ranges).

Note: Options in Blue are SRM models only

These settings are not used. Default is 0.

(D) Setup Port

This setting determines which port, Main or Diagnostics, is used to enter the setup Main Menu.

•1 to only use the main data port for setup.

•2 to only use the secondary diagnostics port for setup.

•3 to use both the main and secondary diagnostics port for setup.

Note: DO NOT change this setting unless the correct port is available. Without the diagnostics port the unit will

no longer be congurable in the eld, if set to 2.

(E) TurnOn/OffDelay

These settings are not used. Default is 0.

(F) FlowControl

This setting species the hardware ow control for the main data port, for connected equipment and for the setup menu.

Most applications do not require handshaking.

XON/XOFF data will be passed through the data port, but will not be utilized in any way.

• 0 to disable ow control (none). (Default)

• 1 to use RTS/CTS ow control.

• 2 to use DTR ow control.

• 3 to use DOT half duplex ow control.

(G) Use break to access setup

This setting species the break character access mode to put the radio into setup mode over the data port.

To send a break character the end device must hold the Tx data line in the space voltage level for longer than 1 character

time. If a character is dened as having 1 start bit, 8 data bits, and 1 stop bit, the character time is 10 bits, thus the Tx data

line must be held in the space voltage level for a period of time longer than 10 bits

•0 to disable break command. (Default)

•1 to use the break command and access the setup menu at the default 19200 baud rate.

•2 to use the break command and access the setup menu at the congured port baud rate.