9
Figure 5 Rear Panel Hardware Configuration
SERIAL
COMMUNICATIONS
CUSTOM
I/O
RELAY CONTACTS
(LEDs)
Table 3 RS232 Technical Specification Summary
CONNECTOR: 25 pin D female
FORMAT:
ASCII, 1 start bit(0), 8 data bits, 1 stop bit(1)
BAUD RATE:
1200
PARITY: None
DUPLEX: Full
PROTOCOL:
None used. Interface is simple 3 wire (RXDATA, TXDATA,
and GND) with no hardware or software handshaking.
MESTA SERIAL COMMUNICATIONS:
"DTE" CONNECTOR
IBM PCAT COMPATIBLE COMPUTER
SIGNAL
PIN
PIN
SIGNAL
TX
RX
GND
2
3
7
2
3
5
RX
TX
GND
25 pin connector
<100 feet
9 pin connector
CURRENT LOOP COMMUNICATIONS:
SIGNAL
PIN
ILTXRET
ILTXSRC
ILRXRET
ILRXSRC
14
7
12
11
25 pins
<1 mile
ISOLATED
CURRENT LOOP
RECEIVER
ISOLATED
CURRENT LOOP
TRANSMITTER
PC