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System Assembly, Construction and Connection
AC500-eCo > Connection and Wiring
2.5.4.2
Serial Interface COM1
The serial interfaces COM1 and COM2 are designed according to the standard EIA RS-485.
Both interfaces can be operated in RS-485 mode.
Parameter
Standard of the serial interfaces
Interface connectors
Electrical isolation
Serial interface parameters
Operating modes
Supported protocols
Table 208: Pin assignment
Serial Interface
Serial Interface
The serial non-isolated interface COM1 is connected to a 9-pole D-sub connector. It is configu-
rable for RS-485 and can be used for:
●
online access with Automation Builder (via RS-485 programming cable e. g. TK504
Ä Chapter 1.8.1.9 "TK504 - Programming Cable" on page 1127),
●
as Modbus RTU, client and server
●
for ASCII serial protocols
●
a CS31 system bus (RS-485), as master only.
1210
According to IEC 60204-1:2016, where control circuits are supplied from an AC
source, transformers having separate windings shall be used to separate the
power supply from the control supply.
Pin
1
2
3
4
5
6
7
8
9
Shield
3ADR010121, 13, en_US
Value
RS-485
COM1: 9-pin D-sub connector (female)
COM2: 5-pole connector with screw-type con-
nection (optional)
none
Configurable by the software
Programming or data exchange
Modbus or serial data exchange using special
software function blocks
Signal
FE
SGND
RxD/TxD-P
Reserved
SGND
+3.3 V
Reserved
RxD/TxD-N
Reserved
Cable shield
Description
Functional earth
0 V power supply, internally
connected to M terminal
Receive/Transmit positive
Reserved, not connected
0 V power supply, internally
connected to M terminal
3.3 V power supply
Reserved, not connected
Receive/Transmit negative
Reserved, not connected
Functional earth
2019/04/17
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