GE GFK-1541B manual RS-485, 15-Pin, D-Type Port, Software Loader Port Pinout

B

RS-485, 15-Pin, D-Type Port

The 15-pin, D-type, RS-485 port is used on the IC693CMM321 (AAUI-only Type) of the Series 90-30 Ethernet Interface and on the Series 90-70 Ethernet Interface module CMM742. It is used to connect to the PC Software Loader when the communications firmware in the Ethernet Interface is to be updated. The Series 90-30 CPU364 Embedded Ethernet Interface uses the RJ- 11 port to connect to the Software Loader.

An RS-232 to RS-485 converter is required to interface to systems that provide RS-232 compatible interfaces.

Port Settings

The serial port of the terminal or PC that is connected to the Ethernet Interface must use the same communications parameters as the Ethernet Interface.

The default values for the Software Loader port are 19,200 bps, 8 bits, Odd parity, and 1 stop bit. If the Ethernet Interface is configured with default values for this port, or the Ethernet Interface has not been configured, use these default values. If the Ethernet Interface is configured with non-default values for this port, use those values for the serial port settings of the terminal or PC.

Software Loader Port Pinout

Pin Number	Signal Name	Description
1	Shield
2		No Connection
3		No Connection
4		No Connection
5	+5V *	+5V Power for RS-232/485 Converter
6	RTS (A)	Request To Send
7	Signal Ground	Signal Ground, 0V
8	CTS (B’)	Clear To Send
9	RT *	Terminating Resistor for RD **
10	RD (A’)	Receive Data
11	RD (B’)	Receive Data
12	SD (A)	Send Data
13	SD (B)	Send Data
14	RTS (B)	Request To Send
15	CTS (A’)	Clear To Send

*Signals available at the Connector but are not included in the RS-485 specification.

SD (Send Data) and RD (Receive Data) are the same as TxD and RXD (used in the Series Six PLC).

(A) and (B) are the same as - and + . A and B denote outputs, and A’ and B’ denote inputs.

**Termination resistance for the Receive Data (RD) signal needs to be connected only on units at the end of multidrop lines. This termination is made by connecting a jumper between pins 9 and 10 inside the 15-pin D-shell; the termination is provided in the adapters and cables specified in

the next table.

B-4 TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual– May 2002 GFK-1541B