AJA Ki Pro Ultra Machine Control Manual page 7

Figure 2. Command Block Format
1.3 Connector Pin Assignment
The pin assignment of the CONTROLLER and the DEVICE is shown in the following
table. The interface connector is a 9 pin D-sub miniature female (D-9S).
Figure 3. RS-422 Pinouts
Pin
1
2
3
4
5
6
7
8
9
A and B are defined as shown below.
Figure 4. Transmit and Receive
1.4 Communication Protocol
1. All communications between the CONTROLLER and the DEVICE will be
under the direct supervision of the CONTROLLER. When the DEVICE receives
the COMMAND from CONTROLLER, the following COMMAND is returned.
• ACK : In case the DEVICE receives a COMMAND not requiring data
• COMMAND + DATA : In case the DEVICE receives a COMMAND requiring
• NAK + ERROR DATA : In case a communication error is detected or an
2. The CONTROLLER must not transmit additional COMMAND blocks to a
DEVICE prior to response to a previous COMMAND block.
3. The CONTROLLER must transmit bytes in a COMMAND block with intervals
less than 10 milliseconds. If a DEVICE detects an interruption of a byte in a
COMMAND BLOCK that exceeds 10 milliseconds, it executes a TIME-OUT
error sequence, voids the receiving COMMAND block, and transmits a NAK
(TIME OUT).
4. When a DEVICE receives a COMMAND block from the CONTROLLER,
the DEVICE must transmit a response within 9 milliseconds. Therefore
if the CONTROLLER cannot receive the appropriate response from the
DEVICE within 10 milliseconds after transmitting the COMMAND block,
Ki Pro Ultra Products Machine Control Guide v3.0
CONTROLLER
Frame Ground
Receive A
Transmit B
Transmit Common
Spare
Receive Common
Receive B
Transmit A
Frame Ground
data
undefined COMMAND is received
DEVICE (Ki Pro)
Frame Ground
Transmit A
Receive B
Receive Common
Spare
Transmit Common
Transmit B
Receive A
Frame Ground
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