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Configuring the MES1A/B
Manual Documentation Number: MES1A/MES1B-2106m PN7138-rev001
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Serial TX Delay after RX
When the MES1A/B receives a request from a master it relays the request to
the Modbus slave connected to the MES1A/B’s serial connection. When the
slave responds a timer is triggered and, after the delay time configured in the
Serial TX Delay after TX field, the next master request is allowed to pass
through the serial connection to the slave. When using 2-wire RS-485
connections, this delay value can be set to ensure that RS-485 devices have
time to disable their drivers and enable their receivers to receive the next
request. Typically this is not a concern and the default value is 0. The delay
can be set to a maximum of 1275 milliseconds.
Swap 4x/0H to Get 3x/1x
This field allows you to configure the MES1A/B to convert holding register
(4x) data to input register (3x) data, and convert coil (0x) data to contact (1x)
data. This is useful when connecting to Modicon I/O scanners.
5) Unit ID to IP Address Lookup Table Settings
The Configuring Unit ID to IP Address Table Settings section of the
Configuration Menu becomes available if the MES1A/B has been configured
as a Modbus Master in Configuration Menu section 2).
From Configuration Menu section 5) you can configure:
• whether to Close Idle TCP Sockets after a specified number of seconds
• whether to enable Redundant entry retries after a specified number of
seconds
• the Unit ID to IP Address Lookup Table
Figure 19. Unit ID -> IP Address Table Settings Menu
Close Idle TCP Sockets After
The Close Idle TCP Sockets After field allows you to configure
whether a socket is held open, or the number of seconds to hold the last
socket open.