Communications Diagnostics Technical data
36
Commander S100 User Guide
4.9 Communication connections
The drive includes a 485 communications port, marked
➊
in Figure 4-15. This allows connection between the drive and: a PC for commissioning; a
controller for drive control; a remote keypad for a drive display outside of an enclosure; or an HMI for an advanced display and system control.
The default baud-rate of the port is 115200 bps to provide compatibility with Control Techniques remote keypads. Intermittent time-outs have been
observed in Connect when operating at a high baud rate if the latency timer of the port is set at its default value of 16 ms. The latency timer should be
reduced to 1 ms in the PC’s COM port advanced properties which can be accessed through the device manager. Alternatively, set the baud rate to
19200 bps on the drive before connecting to the PC. See the description of
Serial Baud Rate
(P4.05) in section 7.3
Changing the latency timer setting may affect other communications software on the user’s PC and advice should be sought from the device
administrator before making this change.
Figure 4-15 Location of the 485 serial communications port
4.9.1 485 serial communications
The drive supports MODBUS RTU protocol. See Table 4-11 for connection details.
Table 4-11 Serial communication port pin-outs (RJ45)
Minimum number of connections are 2, 3 and 7.
Pin
Function
1
Not Connected
2
RX TX
3
0 V
4
+24 V (Total output current 100 mA)
5
Not connected
6
TX enable
7
RX\ TX\
8
RX\ TX\
Shield
Not Connected
Standard Ethernet cables should not be used when connecting drives on a 485 network as they do not have the correct twisted pairs for
the pinout of the serial comms port.
NOTE
CAUTION
Use of shielded cable is recommended. The shield should be connected to ground at one point. This provides high noise immunity against
external interference sources such as motor drives, and A.C. power cables.
WARNING
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