User's Guide ______________________________________________________________________74 __________________________________________________________________ M210205EN-DCAUTION The dip switches behind the DMI500 MUST NOT be touched,because the processor may be destroyed as a result of false dip switchpositions.NOTE Before connecting a PC to DMI500 or DMP501, make sure there isno ground potential difference between PC and the DM500.Serial Communication SettingsConnect the DM500 to PC by using a serial cable (provided). Whenconnecting EIA-232 (RS232), use the port called 'SERIAL'. Whenconnecting optional RS485, use the port called 'RS485/LON'. Connectthe RS485 as follows:Table 2 4-Wire ConnectionTerminal Data Line1 R+ (input to DM500) ←2 R- (input to DM500) ←3 T+ (output from DM500) →4 T- (output from DM500) →5 ShieldTable 3 2-Wire ConnectionTerminal Data Line1 R/T+ connect the same line toterminals 1 and 32 R/T- connect the same line toterminals 2 and 43 R/T+ connect the same line toterminals 1 and 34 R/T- connect the same line toterminals 2 and 45 ShieldSelect the DM500 communication mode and data transfer settings asfollows:1. Open MENU: press .2. Select ►Interfaces, press .
