Communication Interface Protocol - TDK-Lambda Genesys User Manual

8.4.2. Multi Power Supply Connection to RS-232 or RS-485 Bus
Up to 31 units (0 - 30) can be connected to the the RS-232 or RS-485 Digital
communication bus. The first unit connects to the controller via RS-232 or RS-485 (J3-IN)
and the other units are connected with the RS-485 bus.
a) First unit connection: Refer to Section 8.4.1 for connecting the first unit to the
controller.
b) Remaining units connection: The remaining units on the Digital communication bus
are connected via their RS-485 interface.
Refer to Figure 8-5 for typical unit-to-unit connections.
 Set the rear panel setup switch SW1-6 to its UP position (RS-485).
 Using the "Linking" cable (Refer to Fig. 8-6), connect each unit J3-OUT
connector to the next unit J3-IN connector.
8.5.

Communication Interface Protocol

RS232/RS485
1
8
Fig.8-6: Serial Link Cable with RJ-45 shielded connectors (P/N: GEN/RJ-45)
8.5.1. Data format
Serial data format is 8 bit, one start bit and one stop bit. No parity bit.
The address ("ADR n") command must return an "OK" response before any other
8.5.2. Addressing
The Address is sent separately from the command. It is recommended to add a 100msec
delay between a queries or sent command to next unit addressing. Refer to Section
8.7.3 for details.
8.5.3. End of Message
The end of message is the Carriage Return character (ASCII 13). The Power Supply
ignores the Line Feed (ASCII 10) character.
8.5.4. Command Repeat
The backslash character "\" will cause the last command to be repeated.
RS485
IN OUT IN
POWER SUPPLY POWER SUPPLY
#1
Fig 8-5: Multiple power supply RS-232/RS-485 connection
L=0.5m typ.
NAME
PIN NO.
HOUSING
SHIELD
1 SG
-
6 TXD
+
3 TXD
-
5 RXD
4 +
RXD
commands are accepted.
83532002 Rev C
RS485
OUT IN OUT
POWER SUPPLY
#2 #3
PIN NO.
NAME
HOUSING
SHIELD
SG
1
-
RXD
6
3 RXD +
-
5 TXD
4 TXD +
NOTE
80
RS485
IN
OUT
POWER SUPPLY
#31
8
1