Publication 1747-UM005B-EN-P - March 2006
Module Configuration Using an ASCII Terminal
5-11
DF1 Half-duplex Setup Parameters
Parameter
Default
Options
Description
Duplicate Packet
Detection
Disabled
Enabled, Disabled
Determines whether duplicate message detection is Disabled
or Enabled. When enabled, duplicate messages will be
acknowledged and discarded.
Checksum
BCC
BCC, CRC16
Determines the type of error detection that will be used on
the DF1 link. It must be the same as that for the DF1 device.
Constant Carrier Detect
Disabled
Disabled, Enabled
If enabled, hardware handshaking is forced on. The module
will monitor the carrier from the modem (DCD signal) and will
not begin communication until it is detected.
Modem Init String
(blank)
Lets you configure your modem using Hayes commands upon
every power cycle of the module. For example, entering ATDT
here would get the modem’s attention (AT) and set it to tone
dialing (DT). Sending a (~) character will produce a one
second wait on the modem. Refer to your modem user
manual for details.
Modem Init String Delay 0 s
0...25 s
Determines the amount of time the module will wait before
sending the Modem Init String to the modem.
Message Timeout
10,000 ms
100...12,750 ms
The time to wait for a response to a message sent on a DF1
network. This parameter is rounded down to the nearest 50
ms increment. For example, if you enter 199 ms, it is
accepted as 150 ms.
Hardware Handshaking
Disabled
Disabled, Enabled
If enabled, the module will use the RTS and CTS signals for
control of the modem.
Poll Timeout
200 x 5 ms (0...65,535) x 5 ms
Determines the time to wait to be polled by the DF1 master
before a transmission request is ignored.
Message Retries
2
0...254
Determines the number of allowable retries on the DF1 link
before failure.
RTS On Delay
0 x 5 ms
(0...65,535) x 5 ms
Determines the delay between the RTS (Request to Send)
signal and the start of transmission by the module. This
parameter is only required when communicating with the
type of radio modem that requires a delay after exerting the
RTS signal. It only takes effect if hardware handshaking is
enabled. Refer to your modem user manual.
RTS Off Delay
0 x 5 ms
(0...65,499) x 5 ms
Determines the delay between the end of the message and
the module setting RTS (Request to Send) inactive. This
parameter is only required when communicating with
modems that require a delay between sending the last
character and raising the RTS signal. It only takes effect if
hardware handshaking is enabled. Refer to your modem user
manual.
Local/Remote Mode
Local
Local, Remote
Refer to pages 3-3 and 3-4 for a description of these
half-duplex modes.
Slave Address/
Group Number
0
Slave Add. = 0...254
Group No. = 0...7
Slave address is a half-duplex local mode parameter and is
the address of the module on the DF1 link. Group Number is a
half-duplex remote mode parameter and allows a means of
addressing more than 32 DH-485 nodes.
This is explained in detail on page 3-4.
Master Station Address
8 (10 octal) 0...254 (decimal)
Determines the address of the half-duplex DF1 master
device. For slave-to-slave communication, this is the address
of the DF1 slave device. Refer to page 3-10.
Summary of Contents for 1747-KE
Page 1: ...DH 485 RS 232C Interface Module Catalog Number 1747 KE User Manual AB Parts ...
Page 4: ...Publication 1747 UM005B EN P March 2006 2 Summary of Changes Notes ...
Page 12: ...Publication 1747 UM005B EN P March 2006 4 Preface ...
Page 26: ...Publication 1747 UM005B EN P March 2006 2 4 Quick Start ...
Page 88: ...Publication 1747 UM005B EN P March 2006 7 4 Interpret the LED Indicators ...
Page 116: ...Publication 1747 UM005B EN P March 2006 8 28 Application Examples ...
Page 120: ...Publication 1747 UM005B EN P March 2006 A 4 Specifications ...
Page 130: ...Publication 1747 UM005B EN P March 2006 C 6 Lithium Battery Replacement Handling and Disposal ...
Page 134: ...Publication 1747 UM005B EN P March 2006 D 4 Interface Module Configuration Worksheets ...
Page 138: ......
