Serial Data Buffer
Page 8
Expansion Memory
The Data B uffer has fo ur 40-p in heade rs inside the e nclosure to accom moda te
memory modu les of either 1 28K o r 512K mem ory in any combination. Expansion
modules can be separately purchased and are user-installable. Memory modules
must be installed in consecu tive positio ns from left to right. An 8-position
dipswitch inside the enclosure, labeled “
SW2 - Memory Config,
” is used to set the
memory configuration. These switches must be set any time the mem ory cap acity
has chan ged.
The switches are set as follows:
<
– OFF ON –>
1
First Module - Off = 128K; On = 512K
2
Second Module - Off = Present; On = Not Present
3
“
- Off = 128K; On = 512K
4
Third Module - Off = Present; On = Not Present
5
“
- Off = 128K; On = 512K
6
Fourth Module - Off = Present; On = Not Present
7
“
- Off = 128K;
On = 512K
8
Not Used
Cabling
Black Box offers many cable options for use with its serial Data Buffer
products. The following represent the most commonly used:
C
For connection with a Personal Computer serial port (i.e. COMx) as the
input device (DTE to DTE) - order product code EVMBPC.
C
For connection with a Personal Computer serial port (i.e. COMx) as the
output device (DCE to DTE) - order product code EVMBMC.
C
For connection with a serial printer as the output device with DB25F
connector (DCE to DTE) - order product code ECM12C.
C
For connection with a mod em as the output device (DC E to DCE) -
order product code EYN255.
C
For connection with a mod em as the input device (DCE to DTE) -
order product code ECM12C.
