Copyright © 2005
– 2021 R. STAHL TRANBERG AS. All rights reserved. Page 15 of 38
Node type: B = Relay module (8 relays) without current sensing, C = Relay module (8
relays) with current sensing, D = combined dimmer and flasher module.
Node number: Address of the output module. This address corresponds to the address
set on the particular output module, and is in the region of 1
– 77 (octal values).
Manual override: Indicates a manual override on the particular module (1 = Normal, 2 =
Override)
Channel 8
– Channel 1: Status of relay setting: 0 = Disregard/testing, 1 = Off, 2 = On,
no current, 3 = Not used, 4 = On, current ok, 5 = Manual override, no current, 6 =
Manual override, current ok. (Current = current flows in circuit, meaning lamp and fuse
is ok).
Checksum is a 2 digit ASCII hex checksum, MSB first.
Checksum MSB: The MSB of the checksum (e.g. 7 if the checksum is 7E).
Checksum LSB: The LSB of the checksum (e.g. E if the checksum is 7E).
Comments:
When calculating the checksum, the ASCII value of each character has been used. The
checksum is the XOR-ing of all characters between the leading $ -character and
checksum delimiter *.
No spaces occur in any packet.
All packets are ended with a carriage return (CR) and new line (LF).
All characters referred to above are 7-bit ASCII and represented by the appropriate
ASCII number (e.g. a ‘1’ is ASCII character 49, A is 65, B is 66, etc.).
Note on systems delivered prior November 1
st
2017
NOTE: Due to a change in checksum calculation, systems delivered before November
1
st
2017 will have the following format :
The output string is a proprietary NMEA-0183 structure with the following setup:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
$PTRA
1
2
1
1
1
1
C
5
0
1
1
1
4
4
4
4
1
*
1
2
0
$
PTRA
Com
Sta
tu
s
Fa
ilCo
d
e
Net
1
Net
2
Net
3
Net
4
Nod
e
t
y
p
e
Nod
e
n
u
m
b
e
r
M
a
n
ua
l
o
’ri
d
e
Cha
n
n
e
l
8
Cha
n
n
e
l
7
Cha
n
n
e
l
6
Cha
n
n
e
l
5
Cha
n
n
e
l
4
Cha
n
n
e
l
3
Cha
n
n
e
l
2
Cha
n
n
e
l
1
*
Che
c
k
s
u
m
H
Che
c
k
s
u
m
M
Che
c
k
s
u
m
L
Example:
$PTRA,1,2,1,1,1,1,C,5,0,1,1,1,4,4,4,4,1,*,1,2,0
Packet length: 26 characters (normal), plus commas, carriage return and new line.
Total number of characters (including commas) sent are 47 characters, plus carriage
return and new line. Packet lengths are shorter in case of irregularities (see later in this
document).
