Meilhaus Electronic ME-90 Series, Electronic Manual, Page: 33 / 120

3.5 Hardware Options
Depending on the model, the boards differ concerning:
 Number of ports
 Standard-TTL (without opto-isolation), with common
opto-isolation (“I”-models) and with “island-ports” (“p”-
models).
 RS-232 or RS-422/485 ports or mixed.
The “MIX”-versions provide RS-232 as well as RS-422/485 ports.
The RS-232 ports occupy always the lower significant ports
followed by the RS-485 ports.
With the following diagrams you can determine what version you
are using if necessary.
3.5.1 ME-9000 PCI/PCIe/cPCI
3.5.1.1 Multi-I/O Port
On the ME-9000 PCI (from Rev. 1.4 up), ME-9000 cPCI (from
Rev.1.2 up) and ME-9000 PCI-Express the multi-I/O port of the
EXAR XR17D158 chip can be used for customer-specific
extensions. The 26-pin IDC connector (ST2) provides VCC
(depending on model +5 V or +3.3 V), PC ground (GND_PC), 8
multi-I/O pins (MIO_x) and the clock input TMRCK. All the other
pads are not connected (n.c.). The pinout of ST2 can be found in
appendix B5. A detailed description of the chip can be found in the
data-sheet of the manufacturer under www.exar.com.
Attention: VCC at ST2 must not exceed 300 mA!
3.5.1.2 Echo ON/OFF
On the RS-422/485 models of the ME-9000 you can determine the
receiver’s control by soldering bridges at the bottom of the board.
With that you can adapt the single ports to the needs of your
application individually. See also description of the operation modes
from page 56 up.
 Echo ON: Set the soldering bridge „ON“ and the receiver
listens permanently (default setting).