User Manual

Global Transceiver Module (GXM) Wireless Data Transceiver User Manual
LUM0031AA
Version 1.0 23
TurnOn/OffDelay
(E)
These settings are not utilized in the GXM.
FlowControl (F)
This menu specifies the hardware flow control for the Data port. The options for 0-3
are described below.
Menu Port Additional Information
0
None Default – No flow control
1 RTS Uses Standard RTS/CTS control lines
2 DTR
3 DOT
MODBUS RTU TIMING
The Modbus RTU setting causes the radio to wait for an amount of time, “gathering” data before sending
that data out the radio link.
With a Modbus RTU setting of 0 (Disabled), the radio will send data out its radio link as soon as the data
is received into the serial port.
With a Modbus RTU setting of 1, the radio will wait for a number of slots equal to 2 times the Master
Packet Repeat setting before sending the received data out the radio link. For example, if Master Packet
Repeat = 3, the radio will wait for 6 slots, gathering data up the whole time. At the end of the 6 slots, the
radio will send all received data in one “burst”. This is the appropriate setting for most Modbus RTU
devices.
With a setting of 2 and higher, the radio will wait for a number of slots calculated by the following formula:
(Modbus RTU Setting + Master Packet Repeat Setting + 1) x 2
For example, in a radio where the Modbus RTU setting = 2 and the Master Packet Repeat setting = 3,
the radio will wait for “(2+3+1) x 2” slots, or 12 slots.
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