Echelon SmartServer 2.2 Hardware User Manual
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The following table lists the enclosure markings for the RS-232 and RS-485 port screw terminals and
on the SmartServer and their connection types.
Screw Terminal
Enclosure Marking
EIA-232/RS-485 Connection
21
RTS
RS-232 RTS
22
CTS
RS-232 CTS
23
RXD
RS-232 Receive
24
TXD
RS-232 Transmit
25
GND
RS-232 ground/RS-485 ground (as needed)
26
Shield GND
RS-485 cable shield
27
RT-
RS-485 (-)
28
RT+
RS-485 (+)
Connecting an External GSM Modem to the RS-232 Serial Port
You can connect an external GSM modem to your SmartServer using the RS-232 serial port. To do
this, order a special cable from EBV Elektronik (part number ECH-RS232/500). For more
information, go to the EBV Web site a
The serial connector from the modem must be
attached to the RS-232 ports on the SmartServer as specified in the following table.
External GSM
Modem DB 9 Pin
Screw Terminal
Enclosure Marking
1
NC
N/A
2
23
RXD
3
24
TXD
4
NC
N/A
5
25
GND
6
NC
N/A
7
21
RTS
8
22
CTS
9
NC
N/A
SmartServer 2.2 Hardware Guide
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