Technical reference, Electrical interface – JLCooper ES-450SP4 User Manual
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Technical Reference
Electrical Interface
The ES-450SP4 uses the EIA RS-422A protocol over four, female,
9 pin D-Sub connectors. The pinout is listed in the table below:
1
Ground
2
Receive A
3
Transmit B
4
Ground (Transmit)
5
not used
6
Ground (Receive)
7
Receive B
8
Transmit A
9
Ground
The ES-450SP4 sends data at 38.4 kbits/sec. The data format is 1
start bit, 8 data bits, 1 stop bit and 1 parity bit. The parity is odd.
That is, the sum of the data bits and the parity bit is an odd
number.
D7 + D6 + D5 + D4 + D3 + D2 + D1 + D0 + P = odd number
The table below details the pinout of the DB25 connector on the
rear of the ES-450.
ES-450
Function
Machine
1
Machine
2
Machine
3
Machine
4
Ports
1,2,3,4
Ground
21
11
16
6
1
Receive A
22
25
17
20
2
Transmit B
10
12
5
7
3
Receive B
9
13
4
8
7
Transmit A
23
24
18
19
8
Note: Some decks do not use pin 1 for ground so you may have to
connect pin 1 at each end of the ES-450 cable to pins 4 and 6 on your
deck.