Elmo ESD-CC1 - Manual (Page 6)

2.2 Rear connector panel
1. RS-485 connector (please refer to Appendix A for detail definition).
2. Power jack (12Vdc).
3. RS232 9pin D-sub connector.
2.3 Switch setting on rear connector PCB
Warning! This operation is available for system installers only.
A. Release 4 screws on rear cover first.
B. Adjust switch S1, S2, S4 according to the application. As below:
S1 RS485 Setting H ▓ F Half-Duplex (Default, standard RS485)
H ▓ F Full-Duplex (Reserved, =RS422)
S2 RS232 Setting M ▓ S Slave mode (Default, used in download)
M ▓ S Master mode (K.B control another device)
S4 RS232 Control N ▓ V Normal (Default, DTR/DSR function)
N ▓ V VCR control (RTS/CTS function)
1 2 3
- +
6