Delta RMC101 - Manual (Page 488)

RMC100 and RMCWin User Manual
5-238
firmware, see Downloading New Serial/Ethernet Firmware.
• Boot Version
This field gives the version of the Boot firmware in the RMC SERIAL module.
• Loader Version
This field gives the version of the Loader firmware used for updating the main communication
program.
• Hardware Revision
The hardware revision of the RMC SERIAL module is displayed. Unlike the above versions, the
hardware revision cannot be field-upgraded.
The Firmware tab of the Serial Module Options dialog box has the following commands:
• Update
This command initiates the sequence to update the main communication program in the RMC
SERIAL module. Use this button only when directed to do so by Delta technical support.
• Update B/L
This command initiates the sequence to update the Boot and Loader firmware in the RMC
SERIAL module. Use this button only when directed to do so by Delta technical support.
5.5.2.3 Line Drivers: RS-232/422/485
The RMC SERIAL module supports three different line drivers: RS-232, RS-422, and RS-485.
The line driver is selected through RMCWin. The following chart compares these three line
drivers:
RS-232 RS-422
RS-485
(2-wire) RS-485
(4-wire)
Duplex Full Full Half Half/Full*
Differential? No Yes Yes Yes
Topology Point-to-
point Point-to-
point Point-to-
point,
Multi-drop Point-to-
point,
Multi-drop
Wires 3 or 5** 4 + CMN 2 + CMN 4 + CMN
Max
Length*** 50-100 ft 4000 ft 4000 ft 4000 ft
Flow
Control None, or
Hardware None None None
* Four-wire RS-485 can be full-duplex if the topology is point-to-point. It can also be somewhat full-duplex
in a multi-drop scenario in that the master can transmit while a slave is transmitting. However, most
multi-drop protocols do not take advantage of this capability.
** RS-232, as supported by the RMC SERIAL, uses only three wires (RxD, TxD, and GND) if flow control
is disabled, but five wires (RTS, CTS) if flow control is enabled.
*** The maximum cable lengths vary depending on the baud rate, termination (for RS-422/485), and
capacitance of the cable. See RS-232 Wiring for the RMC SERIAL and RS-422/485 Wiring for the
RMC SERIAL for details.
Note: From the RMC SERIAL perspective, RS-422 and 4-wire RS-485 are identical. Therefore,