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Figure 10: RS-232 and Power Connector

The RS-232 connector on the serial cable is wired so that a standard ’straight through’ 9 pin D-sub cable

may be used to connect the modules to a standard serial port such as COM ports on PCs. Note that this

device complies with the EIA232 standard in that it uses signal levels from +/-12V to +/- 12V. It will can

also operate correctly at TTL (0 to +5V) levels. To use standard RS-232 no modiﬁcations are required. For

TTL, please see below.

Table 3: RS-232 Pinout

Pin Number Direction Description LCD Host

2 Data from LCD Data Out (LCD) Tx Rx

3 Data to LCD Data In (LCD) Rx Tx

5 - Ground gnd gnd

2.2.2 TTL Communication

Figure 11: Standard and TTL Conﬁguration

Standard: (+/-12V to +/- 12V) Jumper 1 and 3 soldered

TTL: (0 to +5V) Jumper 2 and 4 soldered

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Matrix-orbital GLK24064-25 Legacy Bedienungsanleitung Seite 13